INHIBITORS OF MsbA AS ANTIBIOTICS, PHARMACEUTICAL COMPOSITIONS, AND USES THEREOF

Abstract

The present disclosure is directed to certain functionalized dual substitute arene derivatives joined by a cyclic or heterocyclic linker of Formula (I); and pharmaceutically acceptable salts thereof, wherein X.sup.1, X.sup.2, Y, Z, G.sup.1, G.sup.2, R.sup.1, R.sup.2, R.sup.3, and R.sup.4 are as defined herein, which are potent inhibitors of MsbA and may be useful in the treatment of infections caused by any multi-drug resistant (MDR) Gram-negative bacteria. The disclosure is also directed to pharmaceutical compositions comprising these compounds and the use of these compounds and compositions in the treatment of infections in which MsbA is involved.

##STR00001##

Claims

1. A compound represented by structural Formula I: ##STR00099## or a pharmaceutically acceptable salt thereof, wherein: X.sup.1 and X.sup.2 are independently selected from CH or N; Y is selected from (CH.sub.2).sub.p, CH.sub.2CH.sub.2C(O), CH.sub.2CHRNHC(O), and NH; Z is selected from NH, O, and a bond; R.sup.1 and R.sup.2 are independently selected from SO.sub.2(OH), (CH.sub.2).sub.nC(O)OR, and PO(OH).sub.2; R is selected from H and C.sub.1-6alkyl; G.sup.1 and G.sup.2 are independently selected from S(O.sub.2), C(O)C(O)NH, and C(O)CH.sub.2; R.sup.3 and R.sup.4 are independently selected from halogen, C.sub.1-6alkyl, C.sub.6-10aryl, C.sub.3-10heterocycloalkyl, and C.sub.4-10heteroaryl, said alkyl, aryl, heterocycloalkyl and heteroaryl optionally substituted with 1 to 3 groups of R.sup.a; R.sup.a is selected from C.sub.1-6alkyl, OC.sub.1-6alkyl, halogen, phenyl, and -Ophenyl, said alkyl, phenyl and pyridyl optionally substituted with 1 to 3 groups of R.sup.b; R.sup.b is selected from C.sub.1-3 haloalkyl, OH, and halogen; n is 0, 1, 2, or 3; and p is 1, 2, 3, or 4.

2. The compound according to claim 1 wherein both of X.sup.1 and X.sup.2 are CH, or one of X.sup.1 and X.sup.2 CH and the other is N.

3. The compound according to claim 1 wherein Y is CH.sub.2.

4. The compound according to claim 1 wherein Y is CH.sub.2CH.sub.2C(O) or CH.sub.2CHRNHC(O).

5. The compound according to claim 1 wherein Y is CH.sub.2CH.sub.2CH.sub.2.

6. The compound according to claim 1 wherein Y is NH.

7. The compound according to claim 1 wherein Z is NH.

8. The compound according to claim 1 wherein Z is O.

9. The compound according to claim 1 wherein Z is a bond.

10. The compound according to claim 1 wherein R.sup.1 and R.sup.2 are (CH.sub.2).sub.nC(O)OR.

11. The compound according to claim 1 wherein Y is selected from CH.sub.2CH.sub.2C(O), CH.sub.2CHRNHC(O), and CH.sub.2CH.sub.2CH.sub.2, CH.sub.2, and NH, Z is NH, O, or a bond, R.sup.1 is C(O)OH, and R.sup.2 is selected from SO.sub.2(OH), C(O)OH and PO(OH).sub.2.

12. The compound according to claim 1 wherein one of G.sup.1 and G.sup.2 is S(O.sub.2) and the other is C(O)C(O)NH or C(O)CH.sub.2.

13. The compound according to claim 1 wherein G.sup.1 and G.sup.2 are both SO.sub.2 or both C(O)C(O)NH.

14. The compound according to claim 1, or a pharmaceutically acceptable salt thereof wherein R.sup.3 and R.sup.4 are both C.sub.6-10aryl, C.sub.4-10 heteroaryl or C.sub.3-10heterocycloalkyl, each optionally substituted with 1 to 3 R.sup.a substituents.

15. The compound according to claim 1, or a pharmaceutically acceptable salt thereof wherein one of R.sup.3 and R.sup.4 is pyrazolyl optionally substituted with 1 to 3 R.sup.a substituents and the other is selected phenyl, morpholinyl, azetidinyl, oxazolidinyl, pyrazolyl, triazolyl, thienyl, thiazolyl, and oxazolyl, wherein each phenyl, morpholinyl, azetidinyl, oxazolidinyl, pyrazolyl, triazolyl, thienyl, thiazolyl, and oxazolyl is optionally substituted with 1 to 3 R.sup.a substituents.

16. The compound according to claim 1, or a pharmaceutically acceptable salt thereof wherein one of R.sup.3 and R.sup.4 is C.sub.1-6alkyl optionally substituted with 1 to 3 R.sup.a substituents and the other is selected from C.sub.1-6alkyl phenyl, morpholinyl, azetidinyl, oxazolidinyl, pyrazolyl, triazolyl, thienyl, thiazolyl, and oxazolyl wherein each alkyl, phenyl, morpholinyl, azetidinyl, oxazolidinyl, pyrazolyl, triazolyl, thienyl, thiazolyl, and oxazolyl is optionally substituted with 1 to 3 R.sup.a substituents.

17. The compound according to claim 1, or a pharmaceutically acceptable salt thereof wherein each R.sup.a is selected from OCH.sub.3, Cl, F, methyl, phenyl, or O-phenyl, wherein each phenyl moiety is unsubstituted or substituted with one to 3 R.sup.b substituents.

18. The compound according to claim 1 represented by Formula II: ##STR00100## wherein Y, Z, G.sup.1, G.sup.2, R.sup.3, and R.sup.4 are as defined in claim 1, and R.sup.c and R.sup.d when present are each independently selected from chlorine and fluorine.

19. A compound, or a pharmaceutically acceptable salt thereof selected from: TABLE-US-00010 Compound Structure 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 and 23

20. A pharmaceutical composition comprising a compound of claim 1, or a pharmaceutically acceptable salt thereof, and a pharmaceutically acceptable carrier.

21. (canceled)

22. A method of treating infections caused by any multi-drug resistant (MDR) Gram-negative bacteria comprising administering an effective amount of a compound of claim 1, or a pharmaceutically acceptable salt thereof, to a person in need thereof.

23. A method of treating bacterial infections in which MsbA is involved comprising administering an effective amount of a compound of claim 1, or a pharmaceutically acceptable salt thereof, or to a person in need thereof.

Description

DETAILED DESCRIPTION OF THE DISCLOSURE

[0005] For each of the following embodiments, any variable not explicitly defined in the embodiment is as defined in Formula I. In each of the embodiments described herein, each variable is selected independently of the other unless otherwise noted.

[0006] In one embodiment, the compounds of the disclosure have the structural Formula I:

##STR00002## [0007] or a pharmaceutically acceptable salt thereof, wherein: [0008] X.sup.1 and X.sup.2 are independently selected from CH or N; [0009] Y is selected from (CH.sub.2).sub.p, CH.sub.2CH.sub.2C(O), CH.sub.2CHRNHC(O), and NH; [0010] Z is selected from NH, O, and a bond; [0011] R.sup.1 and R.sup.2 are independently selected from SO.sub.2(OH), (CH.sub.2).sub.nC(O)OR, and PO(OH).sub.2; [0012] R is selected from H and C.sub.1-6alkyl; [0013] G.sup.1 and G.sup.2 are independently selected from S(O.sub.2), C(O)C(O)NH, and C(O)CH.sub.2; [0014] R.sup.3 and R.sup.4 are independently selected from halogen, C.sub.1-6alkyl, C.sub.6-10 aryl, C.sub.3-10heterocycloalkyl, and C.sub.4-10heteroaryl, said alkyl, aryl, heterocycloalkyl and heteroaryl optionally substituted with 1 to 3 groups of R.sup.a; [0015] R.sup.a is selected from C.sub.1-6alkyl, OC.sub.1-6alkyl, halogen, phenyl, and -Ophenyl, said alkyl, phenyl and pyridyl optionally substituted with 1 to 3 groups of R.sup.b; [0016] R.sup.b is selected from C.sub.1-3 haloalkyl, OH, and halogen; [0017] n is 0, 1, 2, or 3; and [0018] p is 1, 2, 3, or 4.

[0019] An embodiment of Formula I is realized when R is H.

[0020] An embodiment of Formula I is realized when R is C.sub.1-6alkyl. A subembodiment of this aspect of the disclosure is realized when R is CH.sub.3.

[0021] An embodiment of Formula I is realized when one of X.sup.1 and X.sup.2 is CH and the other is N.

[0022] An embodiment of Formula I is realized when both X.sup.1 and X.sup.2 are CH.

[0023] Another embodiment of Formula I is realized when Y is CH.sub.2.

[0024] Another embodiment of Formula I is realized when Y is CH.sub.2CH.sub.2C(O).

[0025] Another embodiment of Formula I is realized when Y is CH.sub.2CHRNHC(O).

[0026] Another embodiment of Formula I is realized when Y is CH.sub.2CH.sub.2CH.sub.2.

[0027] Another embodiment of Formula I is realized when Y is NH.

[0028] Another embodiment of Formula I is realized when Z is NH.

[0029] Another embodiment of Formula I is realized when Z is O.

[0030] Another embodiment of Formula I is realized when Z is a bond.

[0031] Another embodiment of Formula I is realized when Y is selected from CH.sub.2CH.sub.2C(O), CH.sub.2CH.sub.2CH.sub.2, and NH and Z is NH. A subembodiment of this aspect of the disclosure is realized when Y is selected from CH.sub.2CH.sub.2C(O), and CH.sub.2CH.sub.2CH.sub.2 and Z is NH.

[0032] Another embodiment of Formula I is realized when Y is selected from CH.sub.2CH.sub.2C(O), CH.sub.2CH.sub.2CH.sub.2, and NH and Z is O. A subembodiment of this aspect of the disclosure is realized when Y is selected from CH.sub.2CH.sub.2C(O), and CH.sub.2CH.sub.2CH.sub.2 and Z is O.

[0033] Another embodiment of Formula I is realized when Y is selected from CH.sub.2CH.sub.2C(O), CH.sub.2CHRNHC(O), CH.sub.2CH.sub.2CH.sub.2, and NH and Z is a bond. A subembodiment of this aspect of the disclosure is realized when Y is selected from CH.sub.2CH.sub.2C(O), and CH.sub.2CH.sub.2CH.sub.2 and Z is a bond.

[0034] Another embodiment of Formula I is realized when Y is CH.sub.2CH.sub.2C(O) and Z is NH.

[0035] Another embodiment of Formula I is realized when Y is CH.sub.2CHRNHC(O) and Z is a bond.

[0036] Another embodiment of Formula I is realized when Y is selected from C.sub.1-4alkenyl and Z is O.

[0037] Another embodiment of Formula I is realized when Y is selected from CH.sub.2 and CH.sub.2CH.sub.2CH.sub.2, and Z is O.

[0038] Another embodiment of Formula I is realized when Y is CH.sub.2 and Z is O.

[0039] Another embodiment of Formula I is realized when Y is CH.sub.2CH.sub.2CH.sub.2 and Z is O.

[0040] Another embodiment of Formula I is realized when Y is selected from CH.sub.2CH.sub.2C(O), CH.sub.2CH.sub.2CH.sub.2, and NH and Z is a bond.

[0041] Still another embodiment of Formula I is realized when R.sup.1 is (CH.sub.2).sub.nC(O)OR. An aspect of this embodiment is realized when R.sup.1 is CH.sub.2C(O)OH. An aspect of this embodiment is realized when R.sup.1 is C(O)OCH.sub.3 or C(O)OCH.sub.2CH.sub.3. Another aspect of this embodiment is realized when R.sup.1 is C(O)OH.

[0042] Another embodiment of Formula I is realized when R.sup.1 is selected from C(O)OH and PO(OH).sub.2.

[0043] Another embodiment of Formula I is realized when R.sup.1 is PO(OH).sub.2.

[0044] Still another embodiment of Formula I is realized when R.sup.1 is SO.sub.2(OH).

[0045] Still another embodiment of Formula I is realized when R.sup.2 is (CH.sub.2).sub.nC(O)OR. An aspect of this embodiment is realized when R.sup.2 is CH.sub.2C(O)OH. An aspect of this embodiment is realized when R.sup.2 is C(O)OCH.sub.3 or C(O)OCH.sub.2CH.sub.3. Another aspect of this embodiment is realized when R.sup.2 is C(O)OH.

[0046] Another embodiment of Formula I is realized when R.sup.2 is selected from C(O)OH and PO(OH).sub.2.

[0047] Another embodiment of Formula I is realized when R.sup.2 is PO(OH).sub.2.

[0048] Another embodiment of Formula I is realized when R.sup.2 is SO.sub.2(OH).

[0049] Another embodiment of Formula I is realized when R.sup.1 and R.sup.2 are both C(O)OH.

[0050] Another embodiment of Formula I is realized when R.sup.1 and R.sup.2 are both C(O)OCH.sub.3.

[0051] Yet another embodiment of Formula I is realized when Y is selected from CH.sub.2CH.sub.2C(O), CH.sub.2CH.sub.2CH.sub.2, CH.sub.2, and NH, Z is NH and R.sup.1 and R.sup.2 are both C(O)OH or C(O)OCH.sub.3. Still another embodiment of Formula I is realized when Y is selected from CH.sub.2CH.sub.2C(O), CH.sub.2CH.sub.2CH.sub.2, and CH.sub.2, Z is NH and R.sup.1 and R.sup.2 are both C(O)OH or C(O)OCH.sub.3.

[0052] Another embodiment of Formula I is realized when Y is selected from CH.sub.2CH.sub.2C(O), CH.sub.2CH.sub.2CH.sub.2, and CH.sub.2, Z is NH, R.sup.1 is C(O)OH, and R.sup.2 is selected from SO.sub.2(OH), C(O)OH, and PO(OH).sub.2.

[0053] Yet another embodiment of Formula I is realized when Y is selected from CH.sub.2CH.sub.2C(O), CH.sub.2CH.sub.2CH.sub.2, and NH, Z is O and R.sup.1 and R.sup.2 are both C(O)OH or C(O)OCH.sub.3.

[0054] Still another embodiment of Formula I is realized when Y is selected from CH.sub.2CH.sub.2C(O), CH.sub.2CH.sub.2CH.sub.2, and CH.sub.2, Z is O and R.sup.1 and R.sup.2 are both C(O)OH or C(O)OCH.sub.3.

[0055] Yet another embodiment of Formula I is realized when Y is selected from CH.sub.2CH.sub.2C(O), CH.sub.2CH.sub.2CH.sub.2, and CH.sub.2, Z is O, R.sup.1 is C(O)OH, and R.sup.2 is selected from SO.sub.2(OH), C(O)OH and PO(OH).sub.2.

[0056] Yet another embodiment of Formula I is realized when Y is selected from CH.sub.2CH.sub.2C(O), CH.sub.2CH.sub.2CH.sub.2, CH.sub.2, and NH, Z is a bond, and R.sup.1 and R.sup.2 are both C(O)OH or C(O)OCH.sub.3.

[0057] Yet another embodiment of Formula I is realized when Y is selected from CH.sub.2CH.sub.2C(O), CH.sub.2CH.sub.2CH.sub.2, CH.sub.2, and NH, Z is a bond, , R.sup.1 is C(O)OH, and R.sup.2 is selected from SO.sub.2(OH), C(O)OH and PO(OH).sub.2.

[0058] Another embodiment of Formula I is realized when one of G.sup.1 and G.sup.2 is S(O.sub.2) and the other is C(O)C(O)NH.

[0059] Another embodiment of Formula I is realized when one of G.sup.1 and G.sup.2 is S(O.sub.2) and the other is C(O)CH.sub.2.

[0060] Another embodiment of Formula I is realized when both of G.sup.1 and G.sup.2 are C(O)C(O)NH.

[0061] Another embodiment of Formula I is realized when both G.sup.1 and G.sup.2 are S(O.sub.2).

[0062] Still another embodiment of Formula I is realized when at least one of G.sup.1 and G.sup.2 is S(O.sub.2). A subembodiment of this aspect of the disclosure is realized when at least one of G.sup.1 and G.sup.2 is S(O.sub.2), Y is selected from CH.sub.2CH.sub.2C(O), CH.sub.2CH.sub.2CH.sub.2, and NH, Z is NH, R.sup.1 is C(O)OH, and R.sup.2 is selected from C(O)OH and PO(OH).sub.2. Another embodiment of Formula I is realized when at least one of G.sup.1 and G.sup.2 is S(O.sub.2), Y is selected from CH.sub.2CH.sub.2C(O), CH.sub.2CH.sub.2CH.sub.2, and NH, Z is O, R.sup.1 is C(O)OH, and R.sup.2 is selected from SO.sub.2(OH), C(O)OH and PO(OH).sub.2. Another subembodiment of this aspect of the disclosure is realized when at least one of G.sup.1 and G.sup.2 is S(O.sub.2), Y is selected from CH.sub.2CH.sub.2C(O), CH.sub.2CH.sub.2CH.sub.2, and NH, Z is a bond, R.sup.1 is C(O)OH, and R.sup.2 is selected from SO.sub.2(OH), C(O)OH and PO(OH).sub.2.

[0063] Still another embodiment of Formula I is realized when at least one of G.sup.1 and G.sup.2 is C(O)C(O)NH. A subembodiment of this aspect of the disclosure is realized when at least one of G.sup.1 and G.sup.2 is C(O)C(O)NH, Y is selected from CH.sub.2CH.sub.2C(O), CH.sub.2CH.sub.2CH.sub.2, and NH, Z is NH, R.sup.1 is C(O)OH, and R.sup.2 is selected from SO.sub.2(OH), C(O)OH and PO(OH).sub.2. Another embodiment of Formula I is realized when at least one of G.sup.1 and G.sup.2 is C(O)C(O)NH, Y is selected from CH.sub.2CH.sub.2C(O), CH.sub.2CH.sub.2CH.sub.2, and NH, Z is O, and R.sup.2 is selected from SO.sub.2(OH), C(O)OH and PO(OH).sub.2. Another subembodiment of this aspect of the disclosure is realized when at least one of G.sup.1 and G.sup.2 is C(O)C(O)NH, Y is selected from CH.sub.2CH.sub.2C(O), CH.sub.2CH.sub.2CH.sub.2, and NH, Z is a bond, R.sup.1 is C(O)OH, and R.sup.2 is selected from SO.sub.2(OH), C(O)OH and PO(OH).sub.2.

[0064] Still another embodiment of Formula I is realized when at least one of G.sup.1 and G.sup.2 is C(O)CH.sub.2. A subembodiment of this aspect of the disclosure is realized when at least one of G.sup.1 and G.sup.2 is C(O)CH.sub.2, Y is selected from CH.sub.2CH.sub.2C(O), CH.sub.2CH.sub.2CH.sub.2, and NH, Z is NH, and R.sup.2 is selected from C(O)H and PO(OH).sub.2. Another embodiment of Formula I is realized when at least one of G.sup.1 and G.sup.2 is C(O)CH.sub.2, Y is selected from CH.sub.2CH.sub.2C(O), CH.sub.2CH.sub.2CH.sub.2, and NH, Z is O, and R.sup.2 is selected from SO.sub.2(OH), C(O)OH and PO(OH).sub.2. Another subembodiment of this aspect of the disclosure is realized when at least one of G.sup.1 and G.sup.2 is C(O)CH.sub.2, Y is selected from CH.sub.2CH.sub.2C(O), CH.sub.2CH.sub.2CH.sub.2, and NH, Z is a bond, and R.sup.2 is selected from SO.sub.2(OH), C(O)OH and PO(OH).sub.2.

[0065] Another embodiment of Formula I is realized when R.sup.3 is halogen. A subembodiment of this aspect is realized when R.sup.3 is chloro, fluoro, bromo or iodo.

[0066] Another embodiment of Formula I is realized when R.sup.3 is optionally substituted C.sub.1-6alkyl. A subembodiment is realized when R.sup.3 is methyl, unsubstituted, or substituted with one to three R.sup.a substituents. In yet another subembodiment, R.sup.3 is methyl substituted with R.sup.a. In yet another subembodiment, R.sup.3 is para-chlorobenzyl.

[0067] Another embodiment of Formula I is realized when R.sup.3 is optionally substituted C.sub.6-10aryl. A subembodiment of this aspect of the disclosure is realized when the optionally substituted C.sub.6-10aryl of R.sup.3 is phenyl, optionally substituted with one or two R.sup.a substituents.

[0068] Another embodiment of Formula I is realized when R.sup.3 is optionally substituted C.sub.3-10heterocycloalkyl. A subembodiment of this aspect of the disclosure is realized when the optionally substituted C.sub.3-10heterocycloalkyl of R.sup.3 is optionally substituted azetidinyl or morpholinyl.

[0069] Another embodiment of Formula I is realized when R.sup.3 is optionally substituted C.sub.4-10heteroaryl. A subembodiment of this aspect of the disclosure is realized when the optionally substituted heteroaryl of R.sup.3 is selected from optionally substituted pyrazolyl, triazolyl, thienyl, benzothiophenyl, thiazolyl, and oxazolyl. A subembodiment of this aspect of the disclosure is realized when the optionally substituted heteroaryl of R.sup.3 is pyrazolyl, optionally substituted with an R.sup.a substituent. A subembodiment of this aspect of the disclosure is realized when the optionally substituted heteroaryl of R.sup.3 is thienyl, optionally substituted with an R.sup.a substituent. Another embodiment of Formula I is realized when R.sup.3 is selected from substituted C.sub.1-6alkyl and substituted phenyl. A further subembodiment of this aspect of the disclosure is realized when the optionally substituted heteroaryl of R.sup.3 is benzothiophenyl, optionally substituted with an R.sup.a substituent.

[0070] Another embodiment of Formula I is realized when R.sup.4 is halogen. A subembodiment of this aspect is realized when R.sup.4 is chloro, fluoro, bromo or iodo.

[0071] Another embodiment of Formula I is realized when R.sup.3 and R.sup.4 are both halogen. An aspect of Formula I is realized when R.sup.3 and R.sup.4 are independently selected from fluoro, chloro, bromo and iodo

[0072] Another embodiment of Formula I is realized when R.sup.4 is optionally substituted C.sub.1-6alkyl.

[0073] Another embodiment of Formula I is realized when R.sup.4 is optionally substituted C.sub.6-10aryl. A subembodiment of this aspect of the disclosure is realized when the optionally substituted C.sub.6-10aryl of R.sup.4 is phenyl, optionally substituted with one or two R.sup.a substituents.

[0074] Another embodiment of Formula I is realized when R.sup.4 is optionally substituted C.sub.3-10heterocycloalkyl. A subembodiment of this aspect of the disclosure is realized when the optionally substituted C.sub.3-10heterocycloalkyl of R.sup.4 is optionally substituted azetidinyl or morpholinyl.

Another embodiment of Formula I is realized when R.sup.4 is optionally substituted C.sub.4-10heteroaryl. A subembodiment of this aspect of the disclosure is realized when the optionally substituted heteroaryl of R.sup.4 is selected from optionally substituted pyrazolyl, pyridyl, triazolyl, thienyl, benzothiophenyl, thiazolyl, and oxazolyl. A subembodiment of this aspect of the disclosure is realized when the optionally substituted heteroaryl of R.sup.4 is pyrazolyl, optionally substituted with an R.sup.a substituent. A subembodiment of this aspect of the disclosure is realized when the optionally substituted heteroaryl of R.sup.4 is thienyl, optionally substituted with an R.sup.a substituent.

[0075] Another embodiment of Formula I is realized when R.sup.3 and R.sup.4 are both optionally substituted C.sub.6-10 aryl, C.sub.4-10heteroaryl or C.sub.3-10heterocycloalkyl. A subembodiment of this aspect of the disclosure is realized when one of R.sup.3 and R.sup.4 is pyrazolyl and the other is selected from optionally substituted phenyl, morpholinyl, azetidinyl, pyrazolyl, triazolyl, thienyl, benzothiophenyl, thiazolyl, and oxazolyl. Another subembodiment of this aspect of the disclosure is realized when R.sup.3 and R.sup.4 are both optionally substituted pyrazolyl. Another subembodiment of this aspect of the disclosure is realized when R.sup.3 and R.sup.4 are both optionally substituted thienyl.

[0076] Another embodiment of Formula I is realized when one of R.sup.3 and R.sup.4 is optionally substituted phenyl and the other is selected from C.sub.1-6alkyl and optionally substituted phenyl, morpholinyl, azetidinyl, pyrazolyl, triazolyl, thienyl, benzothiophenyl, thiazolyl, and oxazolyl. Another embodiment of Formula I is realized when both R.sup.3 and R.sup.4 are phenyl, optionally substituted with one or two R.sup.a substituents.

[0077] Another embodiment of Formula I is realized when one of R.sup.3 and R.sup.4 is optionally substituted C.sub.1-6alkyl and the other is selected from optionally substituted C.sub.1-6alkyl and optionally substituted phenyl, morpholinyl, azetidinyl, pyrazolyl, triazolyl, thienyl, benzothiophenyl, thiazolyl, and oxazolyl. Another embodiment of Formula I is realized when both R.sup.3 and R.sup.4 are optionally substituted C.sub.1-6alkyl.

[0078] Another embodiment of Formula I is realized when R.sup.a is selected from C.sub.1-6alkyl and phenyl optionally substituted with halogen. A subembodiment of this aspect of the disclosure is realized when each R.sup.a is phenyl, said phenyls independently substituted with 1 to 3 groups of fluorine or chlorine. Another embodiment of Formula I is realized when one R.sup.a is optionally substituted phenyl and the other occurrence of R.sup.a is selected from C.sub.1-6alkyl and optionally substituted phenyl, O-phenyl, and pyridyl.

[0079] Another embodiment of Formula I is realized when there are two occurrences of R.sup.a, both of which are C.sub.1-6alkyl.

[0080] Another embodiment of Formula I is realized when R.sup.b is C.sub.1-3 haloalkyl selected from CH.sub.2F, CHF.sub.2, CF.sub.3, and CCl.sub.3. A subemboiment of this aspect of the invention is realized when R.sup.b is CF.sub.3.

[0081] Another embodiment of Formula I is realized when Rr is selected from CH.sub.2F, CHF.sub.2, CF.sub.3, CCl.sub.3, OH, F, Cl, I, and Br. A subemboiment of this aspect of the invention is realized when R.sup.b is selected from OH, F, Cl, and CF.sub.3.

[0082] In another embodiment, the compounds of Formula I or a pharmaceutically acceptable salt thereof is realized by structural Formula II:

##STR00003##

wherein Y, Z, G.sup.1, G.sup.2, R.sup.3, and R.sup.4 are as described in Formula I, and R.sup.c and R.sup.d when present are independently selected from chlorine and fluorine. (n-butyl is also exemplified

[0083] Another embodiment of Formula II is realized when both G.sup.1 and G.sup.2 are S(O.sub.2).

[0084] Still another embodiment of Formula II is realized when at least one of G.sup.1 and G.sup.2 is S(O.sub.2). A subembodiment of this aspect of the disclosure is realized when at least one of G.sup.1 and G.sup.2 is S(O.sub.2), Y is selected from CH.sub.2CH.sub.2C(O), CH.sub.2CH.sub.2CH.sub.2, and NH, and Z is NH. Another embodiment of Formula II is realized when at least one of G.sup.1 and G.sup.2 is S(O.sub.2), Y is selected from CH.sub.2CH.sub.2C(O), CH.sub.2CH.sub.2CH.sub.2, CH.sub.2, and NH, and Z is O. Another subembodiment of this aspect of the disclosure is realized when at least one of G.sup.1 and G.sup.2 is S(O.sub.2), Y is selected from CH.sub.2CH.sub.2C(O), CH.sub.2CH.sub.2NHRC(O), CH.sub.2CH.sub.2CH.sub.2, and NH, and Z is a bond.

[0085] Still another embodiment of Formula II is realized when at least one of G.sup.1 and G.sup.2 is C(O)C(O)NH. A subembodiment of this aspect of the disclosure is realized when at least one of G.sup.1 and G.sup.2 is C(O)C(O)NH, Y is selected from CH.sub.2CH.sub.2C(O), CH.sub.2CH.sub.2CH.sub.2, and NH, and Z is NH. Another embodiment of Formula II is realized when at least one of G.sup.1 and G.sup.2 is C(O)C(O)NH, Y is selected from CH.sub.2CH.sub.2C(O), CH.sub.2CH.sub.2CH.sub.2, CH.sub.2, and NH, and Z is O. Another subembodiment of this aspect of the disclosure is realized when at least one of G.sup.1 and G.sup.2 is C(O)C(O)NH, Y is selected from CH.sub.2CH.sub.2C(O), CH.sub.2CH.sub.2NHRC(O), CH.sub.2CH.sub.2CH.sub.2, and NH, and Z is a bond.

[0086] Still another embodiment of Formula II is realized when at least one of G.sup.1 and G.sup.2 is C(O)CH.sub.2. A subembodiment of this aspect of the disclosure is realized when at least one of G.sup.1 and G.sup.2 is C(O)CH.sub.2, Y is selected from CH.sub.2CH.sub.2C(O), CH.sub.2CH.sub.2CH.sub.2, and NH, and Z is NH. Another embodiment of Formula II is realized when at least one of G.sup.1 and G.sup.2 is C(O)CH.sub.2, Y is selected from CH.sub.2CH.sub.2C(O), CH.sub.2CH.sub.2CH.sub.2, CH.sub.2, and NH, and Z is O. Another subembodiment of this aspect of the disclosure is realized when at least one of G.sup.1 and G.sup.2 is C(O)CH.sub.2, Y is selected from CH.sub.2CH.sub.2C(O), CH.sub.2CH.sub.2NHRC(O), CH.sub.2CH.sub.2CH.sub.2, and NH, and Z is a bond.

[0087] Another embodiment of Formula II is realized when R.sup.3 and R.sup.4 are both halogen. Another aspect of Formula II is realized when R.sup.3 and R.sup.4 are independently selected from fluoro, chloro, bromo and iodo.

[0088] Another embodiment of Formula II is realized when R.sup.3 and R.sup.4 are both optionally substituted C.sub.6-10 aryl, C.sub.4-10heteroaryl or C.sub.3-10heterocycloalkyl. A subembodiment of this aspect of the disclosure is realized when one of R.sup.3 and R.sup.4 is optionally substituted pyrazolyl and the other is selected from optionally substituted phenyl, morpholinyl, azetidinyl, pyrazolyl, triazolyl, thienyl, benzothiophenyl, thiazolyl, and oxazolyl. Another subembodiment of this aspect of the disclosure is realized when R.sup.3 and R.sup.4 are both optionally substituted pyrazolyl. Another subembodiment of this aspect of the disclosure is realized when R.sup.3 and R.sup.4 are both optionally substituted thienyl.

[0089] Another embodiment of Formula II is realized when one of R.sup.3 and R.sup.4 is optionally substituted phenyl and the other is selected from optionally substituted C.sub.1-6alkyl and optionally substituted phenyl, morpholinyl, azetidinyl, pyrazolyl, triazolyl, thienyl, benzothiophenyl, thiazolyl, and oxazolyl. Another embodiment of Formula II is realized when both R.sup.3 and R.sup.4 are optionally substituted phenyl.

[0090] Another embodiment of Formula II is realized when one of R.sup.3 and R.sup.4 is optionally substituted C.sub.1-6alkyl and the other is selected from optionally substituted C.sub.1-6alkyl and optionally substituted phenyl, morpholinyl, azetidinyl, pyrazolyl, triazolyl, thienyl, benzothiophenyl, thiazolyl, and oxazolyl. Another embodiment of Formula II is realized when both R.sup.3 and R.sup.4 are optionally substituted C.sub.1-6alkyl.

[0091] In each of the preceding embodiments and alternative embodiments described above and herein, pharmaceutically acceptable salts of each embodiment are also contemplated.

[0092] In another embodiment, the compounds of the disclosure include those identified herein as Examples below, and pharmaceutically acceptable salts thereof.

[0093] In another embodiment, the present disclosure provides pharmaceutical compositions comprising a pharmaceutically acceptable carrier and a compound of the disclosure or a pharmaceutically acceptable salt thereof.

[0094] In another embodiment, the present disclosure provides a method of treating bacterial infections caused by MDR Gram-negative bacteria, said method comprising administering to a subject (e.g., mammal, person, or patient) in need of such treatment an effective amount of a compound of the disclosure, or a pharmaceutically acceptable salt thereof, or pharmaceutically acceptable composition thereof. Examples of Gram-negative infections include those caused by Pseudomonas, Klebsiella, Proteus, Salmonella, Providencia, Escherichia, Morganella, Aeromonas, and Citrobacter.

[0095] Another embodiment provides the use of a compound of the disclosure, or a pharmaceutically acceptable salt thereof, and a pharmaceutically acceptable carrier, for the manufacture of a medicament for the treatment of infections caused by MDR gram-negative bacteria. The disclosure may also encompass the use of a compound of the disclosure, or a pharmaceutically acceptable salt thereof, and a pharmaceutically acceptable carrier, in therapy.

[0096] Another embodiment provides for medicaments or pharmaceutical compositions which may be useful for treating bacterial infections which comprise using a compound of the disclosure, or a pharmaceutically acceptable salt thereof, and a pharmaceutically acceptable carrier.

[0097] Another embodiment provides for the use of a compound of the disclosure which may be useful for treating MDR gram-negative bacterial infections in which MsbA is involved.

[0098] Another embodiment provides a method for the manufacture of a medicament or a composition which may be useful for treating MDR gram-negative bacterial infections in which MsbA is involved, comprising combining a compound of the disclosure with one or more pharmaceutically acceptable carriers.

[0099] The compounds of the disclosure may contain one or more asymmetric centers and can thus occur as racemates and racemic mixtures, single enantiomers, diastereomeric mixtures and individual diastereomers. Additional asymmetric centers may be present depending upon the nature of the various substituents on the molecule. Each such asymmetric center will independently produce two optical isomers and it is intended that all of the possible optical isomers and diastereomers in mixtures and as pure or partially purified compounds are included within the ambit of this disclosure. Unless a specific stereochemistry is indicated, the present disclosure is meant to encompass all such isomeric forms of these compounds.

[0100] The independent syntheses of these diastereomers or their chromatographic separations may be achieved as known in the art by appropriate modification of the methodology disclosed herein. Their absolute stereochemistry may be determined by the x-ray crystallography of crystalline products or crystalline intermediates which are derivatized, if necessary, with a reagent containing an asymmetric center of known absolute configuration.

[0101] If desired, racemic mixtures of the compounds may be separated so that the individual enantiomers are isolated. The separation can be carried out by methods well known in the art, such as the coupling of a racemic mixture of compounds to an enantiomerically pure compound to form a diastereomeric mixture, followed by separation of the individual diastereomers by standard methods, such as fractional crystallization or chromatography. The coupling reaction is often the formation of salts using an enantiomerically pure acid or base. The diastereomeric derivatives may then be converted to the pure enantiomers by cleavage of the added chiral residue. The racemic mixture of the compounds can also be separated directly by chromatographic methods utilizing chiral stationary phases, which methods are well known in the art.

[0102] Alternatively, any enantiomer of a compound may be obtained by stereoselective synthesis using optically pure starting materials or reagents of known configuration by methods well known in the art.

[0103] In the compounds of the disclosure, the atoms may exhibit their natural isotopic abundances, or one or more of the atoms may be artificially enriched in a particular isotope having the same atomic number, but an atomic mass or mass number different from the atomic mass or mass number predominantly found in nature. The present disclosure is meant to include all suitable isotopic variations of the compounds of generic Formula I. For example, different isotopic forms of hydrogen (H) include protium (.sup.1H) and deuterium (.sup.2H). Protium is the predominant hydrogen isotope found in nature. Enriching for deuterium may afford certain therapeutic advantages, such as increasing in vivo half-life or reducing dosage requirements, or may provide a compound useful as a standard for characterization of biological samples. Isotopically-enriched compounds within generic Formula I can be prepared without undue experimentation by conventional techniques well known to those skilled in the art or by processes analogous to those described in the Schemes and Examples herein using appropriate isotopically-enriched reagents and/or intermediates.

[0104] When a compound of the disclosure is capable of forming tautomers, all such tautomeric forms are also included within the scope of the present disclosure. For example, compounds including carbonyl CH.sub.2C(O) groups (keto forms) may undergo tautomerism to form hydroxyl CHC(OH) groups (enol forms). Both keto and enol forms, where present, are included within the scope of the present disclosure.

[0105] When any variable (e.g. R.sup.5, etc.) occurs more than one time in any structural formula, its definition on each occurrence is independent at every other occurrence. Also, combinations of substituents and variables are permissible only if such combinations result in stable compounds. Lines drawn into the ring systems from substituents represent that the indicated bond may be attached to any of the substitutable ring atoms. If the ring system is bicyclic, it is intended that the bond be attached to any of the suitable atoms on either ring of the bicyclic moiety.

[0106] It is understood that one or more silicon (Si) atoms can be incorporated into the compounds of the instant disclosure in place of one or more carbon atoms by one of ordinary skill in the art to provide compounds that are chemically stable and that can be readily synthesized by techniques known in the art from readily available starting materials. Carbon and silicon differ in their covalent radius leading to differences in bond distance and the steric arrangement when comparing analogous C-element and Si-element bonds. These differences lead to subtle changes in the size and shape of silicon-containing compounds when compared to carbon. One of ordinary skill in the art would understand that size and shape differences can lead to subtle or dramatic changes in potency, solubility, lack of off-target activity, packaging properties, and so on. (Diass, J. O. et al. Organometallics (2006) 5:1188-1198; Showell, G. A. et al. Bioorganic & Medicinal Chemistry Letters (2006) 16:2555-2558).

[0107] It is understood that substituents and substitution patterns on the compounds of the instant disclosure can be selected by one of ordinary skill in the art to provide compounds that are chemically stable and that can be readily synthesized by techniques known in the art, as well as those methods set forth below, from readily available starting materials. If a substituent is itself substituted with more than one group, it is understood that these multiple groups may be on the same carbon or on different carbons, so long as a stable structure results. The phrase optionally substituted with one or more substituents should be understood as meaning that the group in question is either unsubstituted or may be substituted with one or more substituents.

[0108] (C.sub.1-C.sub.n)Alkyl means an aliphatic hydrocarbon group, which may be straight or branched, comprising 1 to n carbon atoms. Thus, for example, (C.sub.1-C.sub.6)alkyl means an aliphatic hydrocarbon group, which may be straight or branched, comprising 1 to 6 carbon atoms. Similarly, for example, (C.sub.1-C.sub.3)alkyl means an aliphatic hydrocarbon group, which may be straight or branched, comprising 1 to 3 carbon atoms. Branched means that one or more lower alkyl groups such as methyl, ethyl or propyl, are attached to a linear alkyl chain. Non-limiting examples of alkyl groups include methyl, ethyl, n-propyl, isopropyl, n-butyl, i-butyl, and t-butyl.

[0109] Haloalkyl means an alkyl as defined above wherein one or more hydrogen atoms on the alkyl is replaced by a halogen atom. As appreciated by those of skill in the art, halo or halogen as used herein is intended to include chloro (Cl), fluoro (F), bromo (Br) and iodo (I). Chloro (Cl) and fluoro(F) halogens are generally preferred.

[0110] Halogen (or halo) means fluorine (F), chlorine (Cl), bromine (Br), or iodine (I). Preferred are fluorine, chlorine and bromine.

[0111] Alkyl means an aliphatic hydrocarbon group, which may be straight or branched, comprising 1 to 10 carbon atoms. Lower alkyl means a straight or branched alkyl group comprising 1 to 4 carbon atoms. Branched means that one or more lower alkyl groups such as methyl, ethyl or propyl, are attached to a linear alkyl chain. Non-limiting examples of suitable alkyl groups include methyl (Me), ethyl (Et), n-propyl, isopropyl, n-butyl, i-butyl, and t-butyl.

[0112] Aryl means an aromatic monocyclic or multicyclic ring system comprising 6 to 14 carbon atoms, preferably 6 to 10 carbon atoms. Non-limiting examples of suitable aryl groups include phenyl and naphthyl. Monocyclic aryl means phenyl.

[0113] Heteroaryl means an aromatic monocyclic or multicyclic ring system comprising 4 to 14 ring atoms, preferably 5 to 10 ring atoms, in which one or more of the ring atoms is an element other than carbon, for example nitrogen, oxygen or sulfur, alone or in combination. Preferred heteroaryls contain 5 to 6 ring atoms. The prefix aza, oxa or thia before the heteroaryl root name means that at least a nitrogen, oxygen or sulfur atom respectively, is present as a ring atom. A nitrogen atom of a heteroaryl can be optionally oxidized to the corresponding N-oxide. Heteroaryl may also include a heteroaryl as defined above fused to an aryl as defined above. Non-limiting examples of suitable heteroaryls include pyridyl, pyrazinyl, furanyl, thienyl (which alternatively may be referred to as thiophenyl), pyrimidinyl, pyridone (including N-substituted pyridones), isoxazolyl, isothiazolyl, oxazolyl, oxadiazolyl, thiazolyl, thiadiazolyl, pyrazolyl, furazanyl, pyrrolyl, pyrazolyl, triazolyl, 1,2,4-thiadiazolyl, pyrazinyl, pyridazinyl, quinoxalinyl, phthalazinyl, oxindolyl, imidazo[1,2-a]pyridinyl, imidazo[2,1-b]thiazolyl, benzofurazanyl, indolyl, azaindolyl, benzimidazolyl, benzothienyl, quinolinyl, imidazolyl, thienopyridyl, quinazolinyl, thienopyrimidyl, pyrrolopyridyl, imidazopyridyl, isoquinolinyl, benzoazaindolyl, 1,2,4-triazinyl, benzothiazolyl and the like. The term heteroaryl also refers to partially saturated heteroaryl moieties such as, for example, tetrahydroisoquinolyl, tetrahydroquinolyl and the like. The term monocyclic heteroaryl refers to monocyclic versions of heteroaryl as described above and includes 4- to 7-membered monocyclic heteroaryl groups comprising from 1 to 4 ring heteroatoms, said ring heteroatoms being independently selected from the group consisting of N, O, and S, and oxides thereof. The point of attachment to the parent moiety is to any available ring carbon or ring heteroatom. Non-limiting examples of monocyclic heteroaryl moieties include pyridyl, pyrazinyl, furanyl, thienyl, pyrimidinyl, pyridazinyl, pyridone, thiazolyl, isothiazolyl, oxazolyl, oxadiazolyl, isoxazolyl, pyrazolyl, furazanyl, pyrrolyl, pyrazolyl, triazolyl, thiadiazolyl (e.g., 1,2,4-thiadiazolyl), imidazolyl, and triazinyl (e.g., 1,2,4-triazinyl), and oxides thereof.

[0114] Cycloalkyl means a non-aromatic monocyclic or multicyclic ring system comprising 3 to 10 carbon atoms, preferably 3 to 6 carbon atoms. The cycloalkyl can be optionally substituted with one or more substituents, which may be the same or different, as described herein. Monocyclic cycloalkyl refers to monocyclic versions of the cycloalkyl moieties described herein. Non-limiting examples of suitable monocyclic cycloalkyls include cyclopropyl, cyclopentyl, cyclohexyl, cycloheptyl and the like. Non-limiting examples of multicyclic cycloalkyls include [1.1.1]-bicyclo pentane, 1-decalinyl, norbornyl, adamantyl and the like.

[0115] Heterocycloalkyl (or heterocyclyl) means a non-aromatic saturated monocyclic or multicyclic ring system comprising 3 to 10 ring atoms, preferably 5 to 10 ring atoms, in which one or more of the atoms in the ring system is an element other than carbon, for example nitrogen, oxygen or sulfur, alone or in combination. There are no adjacent oxygen and/or sulfur atoms present in the ring system. Preferred heterocyclyls contain 5 to 6 ring atoms. The prefix aza, oxa or thia before the heterocyclyl root name means that at least a nitrogen, oxygen or sulfur atom respectively is present as a ring atom. Any NH in a heterocyclyl ring may exist protected such as, for example, as an N(Boc), N(CBz), N(Tos) group and the like; such protections are also considered part of this disclosure. The heterocyclyl can be optionally substituted by one or more substituents, which may be the same or different, as described herein. The nitrogen or sulfur atom of the heterocyclyl can be optionally oxidized to the corresponding N-oxide, S-oxide or S,S-dioxide. Thus, the term oxide, when it appears in a definition of a variable in a general structure described herein, refers to the corresponding N-oxide, S-oxide, or S,S-dioxide. Heterocyclyl also includes rings wherein O replaces two available hydrogens on the same carbon atom (i.e., heterocyclyl includes rings having a carbonyl group in the ring). Such O groups may be referred to herein as oxo. An example of such a moiety is pyrrolidinone (or pyrrolidone):

##STR00004##

As used herein, the term monocyclic heterocycloalkyl refers to monocyclic versions of the heterocycloalkyl moieties described herein and include a 4- to 7-membered monocyclic heterocycloalkyl groups comprising from 1 to 4 ring heteroatoms, said ring heteroatoms being independently selected from the group consisting of N, N-oxide, O, S, S-oxide, S(O), and S(O).sub.2. The point of attachment to the parent moiety is to any available ring carbon or ring heteroatom. Non-limiting examples of monocyclic heterocycloalkyl groups include azetidinyl, piperidyl, oxetanyl, pyrrolyl, piperazinyl, morpholinyl, thiomorpholinyl, thiazolidinyl, 1,4-dioxanyl, tetrahydrofuranyl (also referred to herein as oxolanyl), tetrahydrothiophenyl, beta lactam, gamma lactam, delta lactam, beta lactone, gamma lactone, delta lactone, and pyrrolidinone, and oxides thereof. Non-limiting examples of lower alkyl-substituted oxetanyl include the moiety:

##STR00005##

[0116] It should be noted that in hetero-atom containing ring systems of this disclosure, there are no hydroxyl groups on carbon atoms adjacent to a N, O or S, as well as there are no N or S groups on carbon adjacent to another heteroatom.

##STR00006##

there is no OH attached directly to carbons marked 2 and 5.

[0117] Any of the foregoing functional groups may be unsubstituted or substituted as described herein. The term substituted means that one or more hydrogens on the designated atom is replaced with a selection from the indicated group, provided that the designated atom's normal valency under the existing circumstances is not exceeded, and that the substitution results in a stable compound. Combinations of substituents and/or variables are permissible only if such combinations result in stable compounds. By stable compound or stable structure is meant a compound that is sufficiently robust to survive isolation to a useful degree of purity from a reaction mixture, and formulation into an efficacious therapeutic agent.

[0118] The term optionally substituted means optional substitution of an available hydrogen atom of the relevant moiety with the specified groups, radicals or moieties.

[0119] When a variable appears more than once in a group, e.g., R.sup.6 in N(R.sup.6).sub.2, or a variable appears more than once in a structure presented herein, the variables can be the same or different.

[0120] The line -, as a bond generally indicates a mixture of, or either of, the possible isomers, e.g., containing (R)- and (S)-stereochemical configuration. For example:

##STR00007##

[0121] Furthermore, unwedged-bolded or unwedged-hashed lines are used in structures containing multiple stereocenters in order to depict relative configuration where it is known. For example:

##STR00008##

whereas:

##STR00009##

[0122] In all cases, compound name(s) accompany the structure drawn and are intended to capture each of the stereochemical permutations that are possible for a given structural isomer based on the synthetic operations employed in its preparation. Lists of discrete stereoisomers that are conjoined using or indicate that the presented compound (e.g. Example number) was isolated as a single stereoisomer, and that the identity of that stereoisomer corresponds to one of the possible configurations listed. Lists of discrete stereoisomers that are conjoined using and indicate that the presented compound was isolated as a racemic mixture or diastereomeric mixture.

[0123] A specific absolute configuration is indicated by use of a wedged-bolded or wedged-hashed line. Unless a specific absolute configuration is indicated, the present disclosure is meant to encompass all such stereoisomeric forms of these compounds.

[0124] The wavy line _, as used herein, indicates a point of attachment to the rest of the compound. Lines drawn into the ring systems, such as, for example:

##STR00010##

indicate that the indicated line (bond) may be attached to any of the substitutable ring carbon atoms.

[0125] In this specification, where there are multiple oxygen and/or sulfur atoms in a ring system, there cannot be any adjacent oxygen and/or sulfur present in said ring system.

[0126] As well known in the art, a bond drawn from a particular atom wherein no moiety is depicted at the terminal end of the bond indicates a methyl group bound through that bond to the atom, unless stated otherwise. For example:

##STR00011##

[0127] The phrase pharmaceutically acceptable is employed herein to refer to those compounds, materials, compositions, and/or dosage forms which are, within the scope of sound medical judgment, suitable for use in contact with the tissues of human beings and animals without excessive toxicity, irritation, allergic response, or other problem or complication, commensurate with a reasonable benefit/risk ratio.

[0128] The compounds can be administered in the form of pharmaceutically acceptable salts. The term pharmaceutically acceptable salt refers to a salt which possesses the effectiveness of the parent compound and which is not biologically or otherwise undesirable (e.g., is neither toxic nor otherwise deleterious to the recipient thereof). When the compounds of the disclosure contain one or more acidic groups or basic groups, the disclosure includes the corresponding pharmaceutically acceptable salts.

[0129] Thus, the compounds of the disclosure that contain acidic groups (e.g., COOH) can be used according to the disclosure as, for example but not limited to, alkali metal salts, alkaline earth metal salts or as ammonium salts. Examples of such salts include but are not limited to sodium salts, potassium salts, calcium salts, magnesium salts or salts with ammonia or organic amines such as, for example, ethylamine, ethanolamine, triethanolamine or amino acids. Compounds of the disclosure which contain one or more basic groups, i.e., groups which can be protonated, can be used according to the disclosure in the form of their acid addition salts with inorganic or organic acids as, for example but not limited to, salts with hydrogen chloride, hydrogen bromide, phosphoric acid, sulfuric acid, nitric acid, benzenesulfonic acid, methanesulfonic acid, p-toluenesulfonic acid, naphthalenedisulfonic acids, oxalic acid, acetic acid, trifluoroacetic acid, tartaric acid, lactic acid, salicylic acid, benzoic acid, formic acid, propionic acid, pivalic acid, diethylacetic acid, malonic acid, succinic acid, pimelic acid, fumaric acid, maleic acid, malic acid, sulfaminic acid, phenylpropionic acid, gluconic acid, ascorbic acid, isonicotinic acid, citric acid, adipic acid, etc. If the compounds of the disclosure simultaneously contain acidic and basic groups in the molecule the disclosure also includes, in addition to the salt forms mentioned, inner salts or betaines (zwitterions). Salts can be obtained from the compounds of the disclosure by customary methods which are known to the person skilled in the art, for example by combination with an organic or inorganic acid or base in a solvent or dispersant, or by anion exchange or cation exchange from other salts. The present disclosure also includes all salts of the compounds of the disclosure which, owing to low physiological compatibility, are not directly suitable for use in pharmaceuticals but which can be used, for example, as intermediates for chemical reactions or for the preparation of pharmaceutically acceptable salts.

[0130] The terms treating or treatment (of, e.g., a disease, disorder, or conditions or associated symptoms, which together or individually may be referred to as indications) as used herein include: inhibiting the disease, disorder or condition, i.e., arresting or reducing the development of the disease or its biological processes or progression or clinical symptoms thereof; or relieving the disease, i.e., causing regression of the disease or its biological processes or progression and/or clinical symptoms thereof Treatment as used herein also refers to control, amelioration, or reduction of risks to the subject afflicted with a disease, disorder or condition caused by Gram-negative bacteria, particularly MDR Gram-negative bacteria. The terms preventing, or prevention or prophylaxis of a disease, disorder or condition as used herein includes: impeding the development or progression of clinical symptoms of the disease, disorder, or condition in a mammal that may be exposed to or predisposed to the disease, disorder or condition but does not yet experience or display symptoms of the disease, and the like.

[0131] As would be evident to those skilled in the art, subjects treated by the methods described herein are generally mammals, including humans and non-human animals (e.g., laboratory animals and companion animals), in whom the treatment of infection caused by Gram negative bacteria, particularly MDR Gram negative bacteria, is indicated or desired. The term therapeutically effective amount means the amount of the subject compound that will elicit the biological or medical response of a tissue, system, animal or human that is being sought by the researcher, veterinarian, medical doctor or other clinician.

[0132] The term composition as used herein is intended to encompass a product comprising a compound of the disclosure or a pharmaceutically acceptable salt thereof, together with one or more additional specified ingredients in the specified amounts, as well as any product which results, directly or indirectly, from combination of the specified ingredients in the specified amounts. Such term in relation to a pharmaceutical composition, is intended to encompass a product comprising the active ingredient(s), which include a compound of the disclosure or a pharmaceutically acceptable salt thereof, optionally together with one or more additional active ingredients, and the inert ingredient(s) that make up the carrier, as well as any product which results, directly or indirectly, from combination, complexation or aggregation of any two or more of the ingredients, or from dissociation of one or more of the ingredients, or from other types of reactions or interactions of one or more of the ingredients. Accordingly, the pharmaceutical compositions of the present disclosure encompass any composition made by admixing a compound of the present disclosure, or a pharmaceutically acceptable salt thereof, and a pharmaceutically acceptable carrier. By pharmaceutically acceptable it is meant the carrier, diluent or excipient must be compatible with the other ingredients of the formulation and not deleterious to the recipient thereof.

[0133] As noted above, additional embodiments of the present disclosure are each directed to a method for the treatment a disease, disorder, or condition, or one or more symptoms thereof (indications) in which caused by Gram negative bacteria, particularly MDR Gram negative bacteria and for which the inhibition of MsbA is desired, which method comprises administering to a subject in need of such treatment a therapeutically effective amount of a compound of the disclosure, or a pharmaceutically acceptable salt thereof, or a pharmaceutical composition comprising said compound or salt thereof.

[0134] In another embodiment, the present disclosure is directed to a method for the manufacture of a medicament for inhibition of MsbA activity in a subject comprising combining a compound of the present disclosure, or a pharmaceutically acceptable salt thereof, with a pharmaceutical carrier or diluent.

[0135] One such embodiment provides a method of treating MRD gram-negative infections in a subject in need thereof, said method comprising administering to a subject in need of such treatment a therapeutically effective amount of a compound of the disclosure, or a pharmaceutically acceptable salt thereof, or a pharmaceutical composition comprising said compound or salt thereof. In one such embodiment, the subject is a human.

[0136] The present disclosure includes within its scope prodrugs of the compounds of this disclosure. In general, such prodrugs will be functional derivatives of the compounds of this disclosure which are readily convertible in vivo into the required compound. Thus, in the methods of treatment of the present disclosure, the terms administration of or administering a compound shall encompass the treatment of the various conditions described with the compound specifically disclosed or with a compound which may not be specifically disclosed, but which converts to the specified compound in vivo after administration to the patient. Conventional procedures for the selection and preparation of suitable prodrug derivatives are described, for example, in Design of Prodrugs, ed. H. Bundgaard, Elsevier, 1985. Metabolites of these compounds include active species produced upon introduction of compounds of this disclosure into the biological milieu.

[0137] The compounds of the present disclosure may be used in combination with one or more other drugs in the treatment, prevention, control, amelioration, or reduction of risk of diseases or conditions for which compounds of the disclosure or the other drugs may have utility, where the combination of the drugs together are safer or more effective than either drug alone. Such other drug(s) may be administered, by a route and in an amount commonly used therefore, contemporaneously or sequentially with a compound of Formula I. When a compound of Formula I is used contemporaneously with one or more other drugs, a pharmaceutical composition in unit dosage form containing such other drugs and the compound of Formula I is preferred. However, the combination therapy may also include therapies in which the compound of Formula I and one or more other drugs are administered on different overlapping schedules. It is also contemplated that when used in combination with one or more other active ingredients, the compounds of the present disclosure and the other active ingredients may be used in lower doses than when each is used singly. Accordingly, the pharmaceutical compositions of the present disclosure include those that contain one or more other active ingredients, in addition to a compound of Formula I.

[0138] The present compounds may be used in conjunction with one or more additional therapeutic agents. For example, the compounds of the disclosure can be used in combination with antibiotic agents for the treatment of infections known or suspected to be caused by A. baumannii or polymicrobial infections where A. baumannii is a known or suspected etiological agent. Examples of antibiotics that can be combined with the compounds of this disclosure include, but are not limited to: penicillins (e.g., phenoxymethylpenicillin, dicloxacillin, amoxicillin with clavulanic acid, ampicillin, nafcillin, oxacillin, penicillin V, penicillin G, and other known penicillins), cephalosporins (e.g., cefaclor, cefazolin, cefadroxil, cephalexin, cefuroxime, cefixime, cefoxitin, ceftriaxone, ceftibuten, cefepime, and other known cephalosporins), carbapenems (e.g., ertapenem, doripenem, imipenem/cilastatin, meropenem, and other known carbapenems), tetracyclines (e.g., doxycycline, minocycline, sarecycline, tigecycline, and other know tetracyclines), macrolides (e.g., erythromycin, clarithromycin, azithromycin, fidaxomicin, roxithromycin, and other know macrolides), lincosamides (e.g., clindamycin, lincomycin, and other known lincosamides), fluoroquinolones (e.g., ciprofloxacin, ofloxacin, levofloxacin, moxifloxacin, and other known fluoroquinolones), sulfonamides (e.g., sulfamethoxazole with trimethoprim, sulfasalazine, sulfacetamide, sulfadiazine silver, and other known sulfonamides), aminoglycosides (e.g., amikacin, gentamicin, kanamycin, neomycin, netilmicin, tobramycin, paromomycin, streptomycin, spectinomycin, and other known aminoglycosides), glycopeptides (e.g., vancomycin, oritavancin, telavancin, and other known glycopeptides), or polypeptides (e.g., colistin, polymyxin B and other known polypeptides). When co-administered with any of these antibiotics or others, the combination of the compound of the disclosure and the antibiotic can provide a synergistic effect. The terms synergistic effect and synergy indicate that the effect produced when two or more drugs are co-administered is greater than would be predicted based on the effect produced when the compounds are administered individually.

[0139] The above combinations include combinations of a compound of the present disclosure not only with one other active compound, but also with two or more other active compounds. Likewise, compounds of the present disclosure may be used in combination with other drugs that are used in the prevention, treatment, control, amelioration, or reduction of risk of the diseases or conditions for which compounds of the present disclosure are useful. Such other drugs may be administered, by a route and in an amount commonly used therefore, contemporaneously or sequentially with a compound of the present disclosure. When a compound of the present disclosure is used contemporaneously with one or more other drugs, a pharmaceutical composition containing such other drugs in addition to the compound of the present disclosure is preferred. Accordingly, the pharmaceutical compositions of the present disclosure include those that also contain one or more other active ingredients, in addition to a compound of the present disclosure.

[0140] The weight ratio of the compound of the present disclosure to the other active ingredient(s) may be varied and will depend upon the effective dose of each ingredient. Generally, an effective dose of each will be used. Thus, for example, when a compound of the present disclosure is combined with another agent, the weight ratio of the compound of the present disclosure to the other agent will generally range from about 1000:1 to about 1:1000, or from about 200:1 to about 1:200. Combinations of a compound of the present disclosure and other active ingredients will generally also be within the aforementioned range, but in each case, an effective dose of each active ingredient should be used.

[0141] In such combinations the compound of the present disclosure and other active agents may be administered separately or in conjunction. In addition, the administration of one element may be prior to, concurrent to, or subsequent to the administration of other agent(s), and via the same or different routes of administration.

[0142] The compounds of the present disclosure may be administered by oral, parenteral (e.g., intramuscular, intraperitoneal, intravenous, ICV, intracisternal injection or infusion, subcutaneous injection, or implant), by inhalation spray, nasal, vaginal, rectal, sublingual, buccal or topical routes of administration and may be formulated, alone or together, in suitable dosage unit formulations containing conventional non-toxic pharmaceutically acceptable carriers, adjuvants and vehicles appropriate for each route of administration. In addition to the treatment of warm-blooded animals the compounds of the disclosure are effective for use in humans.

[0143] The pharmaceutical compositions for the administration of the compounds of this disclosure may conveniently be presented in dosage unit form and may be prepared by any of the methods well known in the art of pharmacy. All methods include the step of bringing the active ingredient into association with the carrier which constitutes one or more accessory ingredients. In general, the pharmaceutical compositions are prepared by uniformly and intimately bringing the active ingredient into association with a liquid carrier or a finely divided solid carrier or both, and then, if necessary, shaping the product into the desired formulation. In the pharmaceutical composition the active compound is included in an amount sufficient to produce the desired effect upon the process or condition of diseases. As used herein, the term composition is intended to encompass a product comprising the specified ingredients in the specified amounts, as well as any product which results, directly or indirectly, from combination of the specified ingredients in the specified amounts.

[0144] The pharmaceutical compositions containing the active ingredient may be in a form suitable for oral use, for example, as tablets, troches, lozenges, aqueous or oily suspensions, dispersible powders or granules, emulsions, solutions, hard or soft capsules, or syrups or elixirs. Compositions intended for oral use may be prepared according to any method known to the art for the manufacture of pharmaceutical compositions and such compositions may contain one or more agents selected from the group consisting of sweetening agents, flavoring agents, coloring agents and preserving agents in order to provide pharmaceutically elegant and palatable preparations. Tablets contain the active ingredient in admixture with non-toxic pharmaceutically acceptable excipients which are suitable for the manufacture of tablets. These excipients may be for example, inert diluents, such as calcium carbonate, sodium carbonate, lactose, calcium phosphate or sodium phosphate; granulating and disintegrating agents, for example, corn starch, or alginic acid; binding agents, for example starch, gelatin or acacia; and lubricating agents, for example magnesium stearate, stearic acid or talc. The tablets may be uncoated, or they may be coated by known techniques to delay disintegration and absorption in the gastrointestinal tract and thereby provide a sustained action over a longer period. For example, a time delay material such as glyceryl monostearate or glyceryl distearate may be employed. They may also be coated by the techniques described in the U.S. Pat. Nos. 4,256,108; 4,166,452; and U.S. Pat. No. 4,265,874 to form osmotic therapeutic tablets for control release. Oral tablets may also be formulated for immediate release, such as fast melt tablets or wafers, rapid dissolve tablets or fast dissolve films.

[0145] Formulations for oral use may also be presented as hard gelatin capsules wherein the active ingredient is mixed with an inert solid diluent, for example, calcium carbonate, calcium phosphate or kaolin, or as soft gelatin capsules wherein the active ingredient is mixed with water or an oil medium, for example peanut oil, liquid paraffin, or olive oil.

[0146] Aqueous suspensions contain the active materials in admixture with excipients suitable for the manufacture of aqueous suspensions. Such excipients are suspending agents, for example sodium carboxymethylcellulose, methylcellulose, hydroxy-propylmethylcellulose, sodium alginate, polyvinyl-pyrrolidone, gum tragacanthin and gum acacia; dispersing or wetting agents may be a naturally-occurring phosphatide, for example lecithin, or condensation products of an alkylene oxide with fatty acids, for example polyoxyethylene stearate, or condensation products of ethylene oxide with long chain aliphatic alcohols, for example heptadecaethyleneoxycetanol, or condensation products of ethylene oxide with partial esters derived from fatty acids and a hexitol such as polyoxyethylene sorbitol monooleate, or condensation products of ethylene oxide with partial esters derived from fatty acids and hexitol anhydrides, for example polyethylene sorbitan monooleate. The aqueous suspensions may also contain one or more preservatives, for example ethyl, or n-propyl, p-hydroxybenzoate, one or more coloring agents, one or more flavoring agents, and one or more sweetening agents, such as sucrose or saccharin.

[0147] Oily suspensions may be formulated by suspending the active ingredient in a vegetable oil, for example arachis oil, olive oil, sesame oil or coconut oil, or in a mineral oil such as liquid paraffin. The oily suspensions may contain a thickening agent, for example beeswax, hard paraffin or cetyl alcohol. Sweetening agents such as those set forth above, and flavoring agents may be added to provide a palatable oral preparation. These compositions may be preserved by the addition of an anti-oxidant such as ascorbic acid.

[0148] Dispersible powders and granules suitable for preparation of an aqueous suspension by the addition of water provide the active ingredient in admixture with a dispersing or wetting agent, suspending agent and one or more preservatives. Suitable dispersing or wetting agents and suspending agents are exemplified by those already mentioned above. Additional excipients, for example sweetening, flavoring and coloring agents, may also be present.

[0149] The pharmaceutical compositions of the disclosure may also be in the form of oil-in-water emulsions. The oily phase may be a vegetable oil, for example olive oil or arachis oil, or a mineral oil, for example liquid paraffin or mixtures of these. Suitable emulsifying agents may be naturally-occurring gums, for example gum acacia or gum tragacanthin, naturally-occurring phosphatides, for example soy bean, lecithin, and esters or partial esters derived from fatty acids and hexitol anhydrides, for example sorbitan monooleate, and condensation products of the said partial esters with ethylene oxide, for example polyoxyethylene sorbitan monooleate. The emulsions may also contain sweetening and flavoring agents.

[0150] Syrups and elixirs may be formulated with sweetening agents, for example glycerol, propylene glycol, sorbitol or sucrose. Such formulations may also contain a demulcent, a preservative and flavoring and coloring agents.

[0151] The pharmaceutical compositions may be in the form of a sterile injectable aqueous or oleaginous suspension. This suspension may be formulated according to the known art using those suitable dispersing or wetting agents and suspending agents which have been mentioned above. The sterile injectable preparation may also be a sterile injectable solution or suspension in a non-toxic parenterally-acceptable diluent or solvent, for example as a solution in 1,3-butane diol. Among the acceptable vehicles and solvents that may be employed are water, Ringer's solution and isotonic sodium chloride solution. In addition, sterile, fixed oils are conventionally employed as a solvent or suspending medium. For this purpose, any bland fixed oil may be employed including synthetic mono- or diglycerides. In addition, fatty acids such as oleic acid find use in the preparation of injectables.

[0152] The compounds of the present disclosure may also be administered in the form of suppositories for rectal administration of the drug. These compositions can be prepared by mixing the drug with a suitable non-irritating excipient which is solid at ordinary temperatures but liquid at the rectal temperature and will therefore melt in the rectum to release the drug. Such materials are cocoa butter and polyethylene glycols.

[0153] For topical use, creams, ointments, jellies, solutions or suspensions and the like, containing the compounds of the present disclosure are employed. Similarly, transdermal patches may also be used for topical administration.

[0154] The pharmaceutical composition and method of the present disclosure may further comprise other therapeutically active compounds as noted herein which are usually applied in the treatment of the above-mentioned pathological conditions.

[0155] In the treatment, prevention, control, amelioration, or reduction of risk of infection caused by Gram negative bacteria, particularly MDR Gram negative bacteria which benefit from the inhibition of MsbA activity an appropriate dosage level will generally be about 0.01 to 500 mg per kg patient body weight per day which can be administered in single or multiple doses. A suitable dosage level may be about 0.01 to 250 mg/kg per day, about 0.05 to 100 mg/kg per day, or about 0.1 to 50 mg/kg per day. Within this range the dosage may be 0.05 to 0.5, 0.5 to 5 or 5 to 50 mg/kg per day. For oral administration, the compositions may be provided in the form of tablets containing 1.0 to 1000 milligrams of the active ingredient, particularly 1.0, 5.0, 10.0, 15.0, 20.0, 25.0, 50.0, 75.0, 100.0, 150.0, 200.0, 250.0, 300.0, 400.0, 500.0, 600.0, 750.0, 800.0, 900.0, and 1000.0 milligrams of the active ingredient for the symptomatic adjustment of the dosage to the patient to be treated. The compounds may be administered on a regimen of 1 to 4 times per day or may be administered once or twice per day.

[0156] It will be understood, however, that the specific dose level and frequency of dosage for any particular patient may be varied and will depend upon a variety of factors including the activity of the specific compound employed, the metabolic stability and length of action of that compound, the age, body weight, general health, sex, diet, mode and time of administration, rate of excretion, drug combination, the severity of the particular condition, and the host undergoing therapy.

[0157] Methods for preparing the compounds of this disclosure are illustrated in the following Schemes and Examples. Starting materials are made according to procedures known in the art or as illustrated herein.

Methods for Making the Compounds of Formula (I):

[0158] The Compounds of Formula (I) may be prepared from known or readily prepared starting materials, following methods known to one skilled in the art of organic synthesis. Representative methods useful for making the Compounds of Formula (I) are set forth in the Examples below. Alternative synthetic pathways and analogous structures will be apparent to those skilled in the art of organic synthesis.

[0159] One skilled in the art of organic synthesis will recognize that the synthesis of multicyclic and/or heterocyclic cores contained in Compounds of Formula (I) may require protection of certain functional groups (i.e., derivatization for the purpose of chemical compatibility with a particular reaction condition). Suitable protecting groups for the various functional groups of these Compounds and methods for their installation and removal are well known in the art of organic chemistry. A summary of many of these methods can be found in Greene et al., Protective Groups in Organic Synthesis, Wiley-Interscience, New York, (1999).

[0160] One skilled in the art of organic synthesis will also recognize that one route for the synthesis of the multicyclic heterocycle cores of the Compounds of Formula (I) may be more desirable depending on the choice of appendage substituents.

[0161] Additionally, one skilled in the art will recognize that in some cases the order of reactions may differ from that presented herein to avoid functional group incompatibilities and thus adjust the synthetic route accordingly.

[0162] The preparation of multicyclic intermediates useful for making the multicyclic and/or heterocyclic cores of the Compounds of Formula (I) have been described in the literature and in compendia such as Comprehensive Heterocyclic Chemistry editions I, II and III, published by Elsevier and edited by A. R. Katritzky & R. JK Taylor. Manipulation of the required substitution patterns have also been described in the available chemical literature as summarized in compendia such as Comprehensive Organic Chemistry published by Elsevier and edited by DH R. Barton and W. D. Ollis; Comprehensive Organic Functional Group Transformations edited by edited by A. R. Katritzky & R. JK Taylor and Comprehensive Organic Transformation published by Wiley-CVH and edited by R. C. Larock.

[0163] The starting materials used and the intermediates prepared using the methods set forth in the Examples below may be isolated and purified if desired using conventional techniques, including but not limited to filtration, distillation, crystallization, chromatography and alike. Such materials can be characterized using conventional means, including physical constants and spectral data.

[0164] One skilled in the art will be aware of standard formulation techniques as set forth in the open literature as well as in textbooks such as Zheng, Formulation and Analytical Development for Low-dose Oral Drug Products, Wiley, 2009, ISBN.

General Schemes for Representative Compounds and Intermediates of Interest:

##STR00012##

[0165] Aldehyde intermediates of the general structure 1 in the present disclosure can be accomplished in two steps starting from appropriately functionalized 4-vinyl-anilines or -aminoheterocycles. The first step involves the reaction of the appropriately functionalized 4-vinyl-anilines or -aminoheterocycles with a sulfonyl chloride in pyridine or an organic solvent with an appropriate base. Styrene oxidation can be accomplished with a variety of homogeneous or heterogeneous catalysts to provide the desired aldehyde.

##STR00013##

[0166] Aldehyde intermediates of the general structure 3 can be prepared in three steps starting from appropriately functionalized primary or secondary amines. The first step involves sulfonylation with tert-butyl chlorosulfonylcarbamate with the appropriately functionalized primary or secondary amines to form the desired sulfamide. Deprotection of the Boc-protecting group is accomplished using acids such as TFA or HCl. Nucleophilic aromatic substation of the deprotected sulfamide with appropriately functioned 4-fluorobenzaldhye furnishes the desired aldehyde.

Preparation of Compounds and Intermediates

[0167] The disclosure is illustrated by the following examples. For all of the examples, standard work-up and purification methods known to those skilled in the art can be utilized. Unless otherwise indicated, all temperatures are expressed in C. (degrees Centigrade). All reactions are conducted at room temperature unless otherwise noted. Synthetic methodologies illustrated herein are intended to exemplify the applicable chemistry through the use of specific examples and are not indicative of the scope of the disclosure.

[0168] The following abbreviations are used herein: [0169] OAc acetate [0170] AcOH acetic acid [0171] anh anhydrous [0172] aq aqueous [0173] Bn Benzyl [0174] BSI bloodstream infection [0175] Boc or BOC tert-butoxycarbonyl [0176] Bz benzoyl [0177] Cbz benzyloxycarbonyl [0178] calc'd calculated [0179] CDI carbonyl diimidazole [0180] Celite diatomaceous earth [0181] CRAB carbapenem-resistant Acinetobacter baumannii [0182] dba dibenzylidineacetone [0183] DBAB di-tert-butyl azodicarboxylate [0184] DBU 1,8-diazabicyclo(5.4.0)undec-7-ene [0185] DCE dichloroethane [0186] DCM dichloromethane [0187] DIEA or DIPEA N,N-diisopropylethylamine [0188] DMAP 4-dimethylaminopyridine [0189] DMF N, N-dimethylformamide [0190] DMP Dess-Martin periodinane [0191] DMSO dimethyl sulfoxide [0192] DNA deoxyribonucleic acid [0193] EDC 1-Ethyl-3-(3-dimethylaminopropyl)carbodiimide [0194] ESI electrospray ionization [0195] Et ethyl [0196] Et.sub.2O diethyl ether [0197] EtOH ethanol [0198] EtOAc ethyl acetate [0199] Et.sub.3N triethylamine [0200] g gram [0201] h hour [0202] HAP hospital-acquired pneumonia [0203] HATU 1-[bis(dimethylamino)methylene]-1H-1,2,3-triazolo[4,5-b]pyridinium 3-oxide hexafluorophosphate [0204] HCl hydrochloric acid [0205] hex hexanes [0206] HMDS hexamethyldisilazane [0207] HPLC high-performance liquid chromatography [0208] IM inner membrane [0209] int Intermediate [0210] IPA isopropanol [0211] iPr isopropyl [0212] LC liquid chromatography [0213] LC/MS liquid chromatography mass spectrometry [0214] LPS lipopolysaccharide [0215] MDR Multi-drug resistant [0216] Me Methyl [0217] MeCN acetonitrile [0218] MeOH methanol [0219] mg milligrams [0220] min minutes [0221] MP-(OAc).sub.3BH MP-triacetoxyborohydride [0222] L microliters [0223] mL milliliters [0224] mmol millimoles [0225] MS mass spectrometry [0226] NMI N-methylimidazole [0227] NMR nuclear magnetic resonance spectroscopy [0228] OM outer membrane [0229] dppf 1,1-bis(diphenylphosphino)ferrocene [0230] Pet. Petroleum [0231] Ph phenyl [0232] ppm parts per million [0233] psi pounds per square inch [0234] Py pyridine [0235] Pd palladium [0236] PPh.sub.3 triphenylphosphine [0237] RT or rt room temperature [0238] Sat saturated [0239] SFC supercritical fluid chromatography [0240] TBAF tert-butyl ammonium fluoride [0241] TBS or TBDMS tert-butyldimethylsilyl [0242] TBSCl tert-butyldimethylsilyl chloride [0243] t-Bu tert-butyl [0244] TEA triethylamine [0245] TBDPS tert-butyldiphenylsilyl [0246] TBDPSCl tert-butyldiphenylsilyl chloride [0247] TCFH chloro-N,N,N,N-tetramethylformamidinium hexafluorophosphate [0248] TMSN.sub.3 trimethylsilyl azide [0249] TMSBr trimethylsilyl bromide [0250] TEA triethylamine [0251] TFA trifluoroacetic acid [0252] THF tetrahydrofuran [0253] TLC thin layer chromatography [0254] TMS trimethylsilyl [0255] Tris tris(hydroxymethyl)aminomethane [0256] UPLC ultra-performance liquid chromatography

General Methods

[0257] Solvents, reagents, and intermediates that are commercially available were used as received. Intermediates that are not commercially available were prepared in the manner as described below. .sup.1H NMR spectra are reported as ppm downfield from Me.sub.4Si with number of protons, multiplicities, and coupling constants in Hertz indicated parenthetically. Where LC/MS data are presented, the observed parent ion is given. Flash column chromatography was performed using pre-packed normal phase silica or bulk silica.

Intermediate 1

Preparation of Intermediate Compound Int-1

##STR00014##

Step 1: 1-(4-chlorophenyl)-1H-pyrazole-4-sulfonyl chloride (Int-1)

##STR00015##

[0258] 1-(4-Chlorophenyl)-1H-pyrazole (1 g, 5.60 mmol) was added dropwise to chlorosulfuric acid (1.5 mL, 22.40 mmol) while stirring at 0 C. under N.sub.2. The reaction mixture was heated to 110 C. for 16 h, then cooled to room temperature, and poured carefully into ice water (10 mL) and extracted with CH.sub.2Cl.sub.2 (10 mL3). The combined organics were washed with brine (10 mL), dried over anhydrous Na.sub.2SO.sub.4, filtered, and concentrated in vacuo. The residue was purified by flash chromatography on SiO.sub.2 [Isco, SepaFlash 12 g column, isocratic eluent of 15% EtOAc/Pet. Ether at 30 mL/min] to provide 1-(4-chlorophenyl)-1H-pyrazole-4-sulfonyl chloride. .sup.1H NMR (500 MHz, CDCl.sub.3) (ppm) 8.51 (s, 1H), 8.18 (s, 1H), 7.68 (d, J=9.0 Hz, 2H), 7.52 (d, J=9.0 Hz, 2H).

[0259] The following intermediate of the present disclosure was made using the methods described in Intermediate 1 above, and substituting the appropriate reactants and/or reagents:

TABLE-US-00001 Compound Structure Int-2 [00016]

Intermediate 3

Preparation of Intermediate Compound Int-3

##STR00017## ##STR00018##

Step 1: methyl 2-(2-amino-5-bromophenyl)acetate (Int-3b)

##STR00019##

[0260] To a solution of methyl 2-(5-bromo-2-nitrophenyl)acetate (1.5 g, 5.47 mmol) in MeOH (20 mL) and water (2 mL) was added NH.sub.4Cl (2.93 g, 54.7 mmol) and iron (3.06 g, 54.7 mmol) at room temperature. The reaction mixture was stirred at 80 C. for 2 h, then filtered and concentrated in vacuo. The resulting reaction mixture was diluted with water (20 mL) and extracted with EtOAc (220 mL). The combined organic layers were washed with water (20 mL) dried over Na.sub.2SO.sub.4, filtered, and the filtrate was concentrated in vacuo. The resulting residue was purified by flash chromatography on SiO.sub.2 [Isco; SepaFlash 12 g column, isocratic eluent of 19% EtOAc/Pet. ether at 30 mL/min] to provide methyl 2-(2-amino-5-bromophenyl)acetate. MS (ESI, m/z): 244.2[M+H.sup.+]. .sup.1H NMR (400 MHz, CD.sub.3OD) (ppm) 7.11-7.16 (m, 2H), 6.67 (d, J=8.4 Hz, 1H), 3.69 (s, 3H), 3.55 (s, 2H).

Step 2: methyl 2-(5-bromo-2-(1-(4-chlorophenyl)-1H-pyrazole-4-sulfonamido) phenyl) acetate (Int-3c)

##STR00020##

[0261] To a solution of methyl 2-(2-amino-5-bromophenyl)acetate (Int-3b; 400 mg, 1.639 mmol) in acetone (3 mL) and pyridine (1 mL) was added 1-(4-chlorophenyl)-1H-pyrazole-4-sulfonyl chloride (Int-1; 681 mg, 2.458 mmol) at room temperature. The reaction mixture was stirred at 60 for 16 h, concentrated in vacuo, and the resulting residue was purified by flash chromatography on SiO.sub.2 [Isco, SepaFlash 12 g column, eluent of 0 to 20% EtOAc/Pet. ether at 30 mL/min] to provide methyl 2-(5-bromo-2-(1-(4-chlorophenyl)-1H-pyrazole-4-sulfonamido)phenyl)acetate. MS (ESI, m/z): 486.0 [M+H.sup.+]. .sup.1H NMR (400 MHz, CDCl.sub.3) (ppm) 8.21 (s, 1H), 8.09 (s, 1H), 7.90 (s, 1H), 7.60 (d, J=9.0 Hz, 2H), 7.45-7.50 (m, 2H), 7.40-7.44 (m, 1H), 7.34-7.39 (m, 2H), 3.73 (s, 3H), 3.49 (s, 2H).

Step 3: methyl 2-(2-(1-(4-chlorophenyl)-1H-pyrazole-4-sulfonamido)-5-vinylphenyl) acetate (Int-3d)

##STR00021##

[0262] A mixture of methyl 2-(5-bromo-2-(1-(4-chlorophenyl)-1H-pyrazole-4-sulfonamido) phenyl)acetate (Int-3c; 450 mg, 0.928 mmol), Pd(dppf)Cl.sub.2 (67.9 mg, 0.093 mmol), and K.sub.3PO.sub.4 (591 mg, 2.78 mmol) in 1,4-dioxane (8 mL) and water (0.8 mL) was degassed under N.sub.2 (3), and the reaction mixture was stirred at 90 C. for 16 h. The reaction mixture was filtered, and the filtrate was concentrated in vacuo. The resulting residue was diluted with EtOAc (20 mL) and washed with water (20 mL). The organic layer was separated, dried over Na.sub.2SO.sub.4, filtered, and concentrated in vacuo. The resulting residue was purified by flash chromatography on SiO.sub.2 [Isco, SepaFlash 4g column, isocratic eluent of 20% EtOAc/Pet. ether at 30 mL/min] to provide methyl 2-(2-(1-(4-chlorophenyl)-1H-pyrazole-4-sulfonamido)-5-vinylphenyl)acetate. MS (ESI, m/z): 432.1 [M+H.sup.+]. .sup.1H NMR (400 MHz, CDCl.sub.3) (ppm) 8.18-8.21 (m, 1H), 8.13 (s, 1H), 7.89 (s, 1H), 7.56-7.61 (m, 2H), 7.44-7.48 (m, 3H), 7.32-7.36 (m, 1H), 7.23 (s, 1H), 6.64 (dd, J=17.4, 10.76 Hz, 1H), 5.71 (d, J=16.8 Hz, 1H), 5.27 (d, J=11.4 Hz, 1H), 3.71-3.73 (m, 3H), 3.51 (s, 2H).

Step 4: methyl 2-(2-(1-(4-chlorophenyl)-1H-pyrazole-4-sulfonamido)-5-formylphenyl) acetate (Int-3)

##STR00022##

[0263] To a solution of methyl 2-(2-(1-(4-chlorophenyl)-1H-pyrazole-4-sulfonamido)-5-vinylphenyl)acetate (Int-3d; 130 mg, 0.301 mmol) in dioxane (4 mL) and water (1 mL) was added 2,6-dimethylpyridine (64.5 mg, 0.602 mmol), potassium dioxidodioxoosmium dihydrate (22.18 mg, 0.060 mmol) and sodium periodate (258 mg, 1.204 mmol) at 0 C. The cooling bath was removed and the reaction mixture was allowed to warm to room temperature while stirring for 3 h. Then the reaction mixture was filtered, quenched with aqueous Na.sub.2SO.sub.3 (5 mL) and water (10 mL) and extracted with EtOAc (10 mL3). The combined organic layers were washed with brine (10 mL), dried over anhydrous Na.sub.2SO.sub.4, filtered and concentrated in vacuo. The resulting residue was purified by preparative TLC (Pet. ether/EtOAc=1:1) to provide methyl 2-(2-(1-(4-chlorophenyl)-1H-pyrazole-4-sulfonamido)-5-formylphenyl)acetate. MS (ESI) m/z: 434.1 [M+H.sup.+].

Intermediate 5-7

Preparation of Intermediate Compounds Int-5, Int-6, and Int-7

##STR00023##

Step 1: 4-butylbenzenesulfonyl chloride (Int-5)

##STR00024##

[0264] To a solution of butylbenzene (Int-5a; 20 g, 149 mmol) in CHCl.sub.3 (240 mL) was added sulfurochloridic acid (80 mL, 1195 mmol) at 0 C. The reaction was allowed to warm to room temperature and stirred for 15 h. The mixture was then poured into ice water (600 mL) and extracted with CH.sub.2Cl.sub.2 (2500 mL). The combined extracts were washed with H.sub.2O (120 mL), sat. aq. NaHCO.sub.3 (120 mL), and brine (120 mL), dried over anh. Na.sub.2SO.sub.4, filtered, and concentrated in vacuo. The resulting residue was purified by column chromatography on SiO.sub.2 [Isco, Silica 120 g column, isocratic eluent of 6% EtOAc/Pet. ether at 30 mL/min] to provide 4-butylbenzene-1-sulfonyl chloride. .sup.1H NMR (500 MHz, CDCl.sub.3) (ppm) 7.95 (d, J=8.39 Hz, 2H), 7.42 (d, J=8.54 Hz, 2H), 2.71-2.78 (m, 2H), 1.61-1.70 (m, 2H), 1.36-1.41 (m, 2H), 0.95 (t, J=7.40 Hz, 3H).

Step 2: methyl 2-((4-butylphenyl)sulfonamido)-5-nitrobenzoate (Int-6b)

##STR00025##

[0265] A solution of methyl 2-amino-5-nitrobenzoate (Int-6a; 10 g, 51.0 mmol) in THF (60 mL) at 0 C. was treated with NaH (8.16 g, 204 mmol, 60% in oil). The reaction mixture was stirred at 0 C. for 0.5 h and then a solution of 4-butylbenzene-1-sulfonyl chloride (Int-5; (23.73 g, 102 mmol) in THF (40 mL) was added slowly at 0 C. The reaction was stirred at 0 C. for 2 h, quenched with sat. aq. NH.sub.4Cl (100 mL), and extracted with EtOAc (2100 mL). The combined organic layers were dried over anh. Na.sub.2SO.sub.4, filtered, and concentrated in vacuo. The resulting residue was purified by column chromatography on SiO.sub.2 [Isco, Agela 120 g column Silica-CS, eluent of 0 to 20% EtOAc/Pet. ether at 30 mL/min then 100% CH.sub.2Cl.sub.2 (isocratic) at 30 mL/min] to provide methyl 2-(4-butylphenylsulfonamido)-5-nitrobenzoate. MS (ESI, m/z). 390.0 [M+H.sup.+]. .sup.1H NMR (400 MHz, CDCl.sub.3) (ppm) 8.83 (d, J=2.7 Hz, 1H), 8.26 (dd, J=2.7, 9.3 Hz, 1H), 7.80 (dd, J=8.8, 13.7 Hz, 3H), 7.28 (d, J=8.3 Hz, 2H), 4.02-3.91 (m, 3H), 2.67-2.58 (m, 2H), 1.57-1.51 (m, 2H), 1.36-1.27 (m, 2H), 0.88 (t, J=7.3 Hz, 3H).

Step 3: methyl 5-amino-2-((4-butylphenyl)sulfonamido)benzoate (Int-6)

##STR00026##

[0266] To a solution of methyl 2-(4-butylphenylsulfonamido)-5-nitrobenzoate (Int-6b; 19.1 g, 48.7 mmol) in MeOH (200 mL), THF (200 mL), and sat. aq. NH.sub.4Cl (40 mL) was added zinc (31.8 g, 487 mmol) portion-wise at room temperature. The reaction was heated to 75 C. and stirred for 3 h, then filtered and concentrated in vacuo. The resulting residue was diluted with CH.sub.2Cl.sub.2 (40 mL) and washed with H.sub.2O (10 mL). The organics were dried over anh. Na.sub.2SO.sub.4, filtered and concentrated in vacuo. The resulting residue was purified by column chromatography on SiO.sub.2 [Isco, Agela 80 g Column Silica-CS, isocratic eluent of 35% EtOAc/Pet. ether at 30 mL/min] to provide methyl 5-amino-2-(4-butylphenylsulfonamido)-benzoate.

Step 4: methyl 5-(4-(tert-butoxy)-4-oxobutanamido)-2-((4-butylphenyl)sulfonamido)-benzoate (Int-7a)

##STR00027##

[0267] To a stirred solution of 4-(tert-butoxy)-4-oxobutanoic acid (2.42 g, 13.89 mmol) and methyl 5-amino-2-(4-butylphenylsulfonamido)benzoate (Int-6; 5.04 g, 13.89 mmol) in CH.sub.2Cl.sub.2 (20 mL), was added HATU (5.55 g, 14.59 mmol) and DIEA (7.28 mL, 41.7 mmol) at room temperature. The reaction mixture was stirred at 40 C. for 1 h, diluted with H.sub.2O (10 mL), extracted with EtOAc (320 mL), and the organics were dried over anh. Na.sub.2SO.sub.4, filtered, and concentrated in vacuo. The resulting residue was purified by column chromatography on SiO.sub.2 [Isco, Agela 8 g column Silica-CS (8 g), eluent of 0 to 25% EtOAc/Pet. ether at 30 mL/min] to provide methyl 5-(4-(tert-butoxy)-4-oxobutanamido)-2-(4-butylphenylsulfonamido)benzoate. MS (ESI, m/z): 519.1 [M+H.sup.+].

Step 4: 4-((4-((4-butylphenyl)sulfonamido)-3-(methoxycarbonyl)phenyl)amino)-4-oxobutanoic acid (Int-7)

##STR00028##

[0268] To a solution of methyl 5-(4-(tert-butoxy)-4-oxobutanamido)-2-(4-butylphenyl-sulfonamido) benzoate (Int-7a; 4.3 g, 8.29 mmol) in CH.sub.2Cl.sub.2 (50 mL), was added TFA (5 mL, 64.9 mmol) at room temperature. The reaction mixture was stirred at 40 C. for 1 h, concentrated in vacuo, and the resulting residue was purified by column chromatography on SiO.sub.2 [Isco, Agela 20 g column Silica-CS, isocratic eluent of 60% EtOAc/Pet. ether at 30 mL/min] to provide 4-((4-(4-butylphenyl-sulfonamido)-3-(methoxycarbonyl) phenyl)amino)-4-oxobutanoic acid. MS (ESI, m/z): 445.1 [M+H.sup.+]. .sup.1H NMR (400 MHz, CDCl.sub.3) (ppm) 7.90 (d, J=2.4 Hz, 1H), 7.75 (dd, J=16.0, 8.4 Hz, 3H), 7.48 (dd, J=8.8, 2.4 Hz, 1H), 7.33 (d, J=8.8 Hz, 2H), 3.87 (s, 3H), 2.82 (s, 4H), 2.64 (br d, J=7.6 Hz, 2H), 1.53-1.59 (m, 2H), 1.26-1.34 (m, 2H), 0.91 (t, J=7.2 Hz, 3H).

Intermediate 8

Preparation of Intermediate Compound Int-8

##STR00029##

Step 1: methyl 2-(1-(4-chlorophenyl)-1H-pyrazole-4-sulfonamido)-5-vinylbenzoate (Int-8a)

##STR00030##

[0269] To a solution of methyl 2-amino-5-vinylbenzoate (4 g, 22.57 mmol) in MeCN (50 mL) and pyridine (10 mL) was added 1-(4-chlorophenyl)-1H-pyrazole-4-sulfonyl chloride (Int-1; 6.57 g, 23.70 mmol) and DMAP (0.276 g, 2.257 mmol). The reaction mixture was heated at 55 C. and stirred for 16 h, concentrated in vacuo, and the resulting residue was purified by flash chromatography on SiO.sub.2 [Isco, SepaFlash 40 g column, eluent of 14% EtOAc/Pet. ether gradient at 40 mL/min] to provide methyl 2-(1-(4-chlorophenyl)-1H-pyrazole-4-sulfonamido)-5-vinylbenzoate. MS (ESI, m/z): 418.0 [M+H.sup.+]. .sup.1H NMR (400 MHz, CDCl.sub.3) 10.66 (s, 1H), 8.25 (s, 1H), 7.98 (d, J=2.0 Hz, 1H), 7.89 (s, 1H), 7.76 (d, J=8.6 Hz, 1H), 7.61-7.52 (m, 3H), 7.48-7.39 (m, 2H), 6.63 (dd, J=11.0, 17.6 Hz, 1H), 5.71 (d, J=17.6 Hz, 1H), 5.27 (d, J=11.0 Hz, 1H), 3.90 (s, 3H).

Step 2: methyl 2-(1-(4-chlorophenyl)-1H-pyrazole-4-sulfonamido)-5-formylbenzoate (Int-8)

##STR00031##

[0270] To a solution of methyl 2-(1-(4-chlorophenyl)-1H-pyrazole-4-sulfonamido)-5-vinyl-benzoate (Int-8a; 3.7 g, 8.85 mmol) in 1,4-dioxane (120 mL) and H.sub.2O (30 mL) was added 2,6-dimethylpyridine (2.063 mL, 17.71 mmol), sodium periodate (7.58 g, 35.4 mmol) and potassium osmate(VI) dihydrate (0.652 g, 1.771 mmol) at 0 C. The reaction mixture was warmed to room temperature and stirred for 16 h. Then the reaction mixture was filtered, quenched with sat. aq. Na.sub.2SO.sub.3 (200 mL) and H.sub.2O (100 mL), and extracted with EtOAc (3100 mL). The organics were washed with brine (300 mL), dried over anh. Na.sub.2SO.sub.4, filtered, and concentrated in vacuo. The resulting residue was purified by flash chromatography on SiO.sub.2 [Isco, Agela 12 g column, eluent of 20% EtOAc/Pet. ether gradient at 35 m/min] to provide methyl 2-(1-(4-chlorophenyl)-1H-pyrazole-4-sulfonamido)-5-formylbenzoate. This material was then further washed with EtOAc/Pet.ether (1:5, 40 mL), concentrated in vacuo, and dried under vacuum to provide the final product. MS (ESI, m/z): 419.9 [M+H.sup.+]. .sup.1H NMR (500 MHz, CDCl.sub.3) =11.25 (s, 1H), 9.92 (s, 1H), 8.53 (d, J=2.0 Hz, 1H), 8.37 (s, 1H), 8.03 (d, J=8.6 Hz, 1H), 8.00 (s, 1H), 7.92 (d, J=8.5 Hz, 1H), 7.62-7.57 (m, 2H), 7.48-7.44 (m, 2H), 3.98 (s, 3H).

[0271] The following intermediate of the present disclosure was made using the methods described in Intermediate 8 above, and substituting the appropriate reactants and/or reagents:

TABLE-US-00002 Intermediate Structure Int-9 [00032]

Intermediate 10

Preparation of Intermediate 10

##STR00033##

Step 1: 1-(4-chlorophenyl)-1H-pyrazole-4-sulfonamide (Int-10a)

##STR00034##

[0272] To a stirred solution of 1-(4-chlorophenyl)-1H-pyrazole-4-sulfonyl chloride (2 g, 7.22 mmol) in THF (20 mL) was added aq. NH.sub.3.Math.H.sub.2O (10 mL) at 20 C. The reaction was stirred at 20 C. for 15 h, concentrated in vacuo, and the resulting residue was washed with H.sub.2O (310 mL) and EtOAc (310 mL) and then filtered to afford 1-(4-chlorophenyl)-1H-pyrazole-4-sulfonamide. MS (ESI) m/z: 258.0 [M+H.sup.+]. .sup.1H NMR (400 MHz, DMSO-d.sub.6) =8.98 (s, 1H), 8.02 (s, 1H), 7.92 (d, J=8.6 Hz, 2H), 7.66-7.54 (m, 2H), 7.42 (s, 2H).

Step 2: methyl 2-((1-(4-chlorophenyl)-1H-pyrazole)-4-sulfonamido)-5-nitrobenzoate (Int-10b)

##STR00035##

[0273] To a solution of methyl 2-fluoro-5-nitrobenzoate (1.159 g, 5.82 mmol) in DMF (10 mL) were added 1-(4-chlorophenyl)-1H-pyrazole-4-sulfonamide (1.5 g, 5.82 mmol) and K.sub.2CO.sub.3 (1.609 g, 11.64 mmol) at room temperature. The reaction mixture was stirred at room temperature for 15 h, diluted with H.sub.2O (50 mL), and then extracted with EtOAc (320 mL). The organics were washed with H.sub.2O (20 mL), dried over anh. Na.sub.2SO.sub.4, and filtered. The filtrate was concentrated in vacuo to provide methyl 2-(1-(4-chlorophenyl)-1H-pyrazole-4-sulfonamido)-5-nitrobenzoate, which was used in the subsequent step without further purification. .sup.1H NMR (400 MHz, DMSO-d6) ppm 11.03 (s, 1H), 9.41 (s, 1H), 8.62-8.63 (m, 1H), 8.36-8.40 (m, 1H), 8.33 (s, 1H), 7.90 (d, J=8.0 Hz, 2H), 7.83 (d, J=8.0 Hz, 1H), 7.59 (d, J=8.0 Hz, 2H), 3.90 (s, 3H).

Step 3: methyl 5-amino-2-((1-(4-chlorophenyl)-JH-pyrazole)-4-sulfonamido)benzoate (Int-17)

##STR00036##

[0274] To a solution of methyl 2-(1-(4-chlorophenyl)-1H-pyrazole-4-sulfonamido)-5-nitrobenzoate (2.5 g, 5.72 mmol) in MeOH (30 mL), DMSO (50 mL), and H.sub.2O (10 mL) was added iron (3.20 g, 57.2 mmol) and NH.sub.4Cl (3.06 g, 57.2 mmol) at room temperature. The reaction mixture was stirred at 80 C. for 15 h. After cooling to room temperature, the mixture was filtered and the filtrate was concentrated in vacuo. The resulting mixture was diluted with H.sub.2O (100 mL) and extracted with EtOAc (340 mL). The organic layers were combined, washed with brine (200 mL), dried over anh. Na.sub.2SO.sub.4, filtered, and concentrated in vacuo. The resulting residue was purified by flash chromatography on SiO.sub.2 eluting with 1:2 mixture of EtOAc:ether give provide 5-amino-2-(1-(4-chlorophenyl)-1H-pyrazole-4-sulfonamido)benzoate. .sup.1H NMR (400 MHz, DMSO-d.sub.6) ppm 9.47 (br s, 1H), 8.95 (s, 1H), 7.94-7.77 (m, 3H), 7.57 (br d, J=8.0 Hz, 2H), 7.17 (br d, J=8.0 Hz, 1H), 6.98 (br s, 1H), 6.76 (br d, J=8.0 Hz, 1H), 5.38 (br s, 2H), 3.66 (s, 3H).

[0275] The following intermediate of the present disclosure was made using the methods described in Intermediate 10 above, and substituting the appropriate reactants and/or reagents:

TABLE-US-00003 Compound Structure Int-11 [00037]

Intermediate 12

Preparation of Intermediate 12

##STR00038##

Step 1: methyl 2-((2-(4-fluorophenyl)ethyl)sulfonamido)-5-formylbenzoate (Int-12)

##STR00039##

[0276] To a stirred mixture of 2-(4-fluorophenyl)ethane-1-sulfonamide (50 mg, 0.246 mmol) in THF (1 mL) was added methyl 2-fluoro-5-formylbenzoate (44.8 mg, 0.246 mmol), Cs.sub.2CO.sub.3 (240 mg, 0.738 mmol), and 18-crown-6 (65.0 mg, 0.246 mmol) at 25 C. The reaction mixture was stirred at 80 C. for 16 h. concentrated in vacuo, and the resulting residue was purified by flash chromatography on SiO.sub.2 [Isco; Silica Flash 20 g Column, eluent of 35 to 100% EtOAc/Pet. ether gradient at 35 mL/min] to provide methyl 2-((2-(4-fluorophenyl)ethyl)-sulfonamido)-5-formylbenzoate. MS (ESI) m/z: 366.0 [M+H.sup.+]. .sup.1H NMR (500 MHz, chloroform-d) ppm 3.10-3.20 (m, 2H) 3.46-3.56 (m, 2H) 3.98 (s, 3H) 6.84-6.97 (m, 2H) 7.07 (dd, J=8.54, 5.34 Hz, 2H) 7.87 (d, J=8.70 Hz, 1H) 8.04 (dd, J=8.70, 1.98 Hz, 1H) 8.54 (d, J=1.98 Hz, 1H) 9.94 (s, 1H).

Intermediate 13

Preparation of Intermediate 13

##STR00040##

Step 1: methyl 2-(4-bromophenylsulfonamido)-5-vinylbenzoate (Int-13b)

##STR00041##

[0277] To a stirred solution of methyl 2-amino-5-vinylbenzoate (0.5 g, 2.82 mmol) in pyridine (10 ml) was added 4-bromobenzene-1-sulfonyl chloride (1.081 g, 4.23 mmol) at 25 C. The reaction mixture was stirred at 50 C. for 16 h, then diluted with H.sub.2O (20 mL) and extracted with EtOAc (220 mL). The organics were dried over anh. Na.sub.2SO.sub.4, filtered, and the filtrate was concentrated in vacuo. The resulting residue was purified by flash chromatography on SiO.sub.2 [Isco, Agela Flash 20 g Column, eluent of 10% EtOAc/Pet. ether isocratic gradient at 35 mL/min) to provide methyl 2-(4-bromophenylsulfonamido)-5-vinylbenzoate. MS (ESI) m/z: 395.9, 397.9 [M+H.sup.+]. .sup.1H NMR (500 MHz, chloroform-d) 10.49-10.72 (m, 1H), 7.93 (d, J=2.14 Hz, 1H), 7.64-7.73 (m, 3H), 7.50-7.59 (m, 3H), 6.55-6.66 (m, 1H), 5.69 (d, J=17.55 Hz, 1H), 5.26 (d, J=10.99 Hz, 1H), 3.88-3.90 (m, 3H)

Step 2: methyl 2-(4-bromophenylsulfonamido)-5-formylbenzoate (Int-13c)

##STR00042##

[0278] To a solution of methyl 2-(4-bromophenylsulfonamido)-5-vinylbenzoate (100 mg, 0.252 mmol) in 1,4-dioxane (4 mL) and H.sub.2O (1 mL) was added 2,6-dimethylpyridine (0.059 mL, 0.505 mmol), sodium periodate (216 mg, 1.009 mmol) and potassium osmate (VI) dihydrate (9.30 mg, 0.025 mmol) at 0 C. The cooling bath was removed and the reaction mixture was allowed to warm to room temperature while stirring for 16 h. The reaction mixture was filtered, quenched with H.sub.2O (10 mL) and extracted with EtOAc (310 mL). The organics were washed with brine (10 mL), dried over anh. Na.sub.2SO.sub.4, filtered, and concentrated in vacuo. The resulting residue was purified by preparative TLC (EtOAc/Pet. ether 1/3) to provide methyl 2-(4-bromophenylsulfonamido)-5-formylbenzoate. MS (ESI) m/z: 397.9,399.9 [M+H.sup.+]. .sup.1H NMR (400 MHz, CDCl.sub.3) 11.18 (br s, 1H), 9.85-9.92 (m, 1H), 8.49 (d, J=1.96 Hz, 1H), 7.92-7.99 (m, 1H), 7.75-7.83 (m, 3H), 7.63 (d, J=8.61 Hz, 2H), 3.97 (s, 3H).

Step 3: methyl 2-((4-fluoro-[1,1-biphenyl])-4-sulfonamido)-5-formylbenzoate (Int-13)

##STR00043##

[0279] To a stirred mixture of methyl 2-((4-bromophenyl)sulfonamido)-5-formylbenzoate (Int-13c; 7 g, 17.58 mmol)) in 1,4dioxane (140 mL) was added (4-fluorophenyl)boronic acid (2.95 g, 21.09 mmol), PdCl.sub.2(dppf) (1.286 g, 1.758 mmol) and potassium phosphate tribasic (11.19 g, 52.7 mmol) at 25 C. The reaction mixture was stirred at 80 C. for 6 h under N.sub.2. The reaction mixture was cooled to room temperature, diluted with EtOAc (100 mL), washed with H.sub.2O (100 mL), dried over Na.sub.2SO.sub.4, filtered, and the filtrate was concentrated in vacuo. EtOAc (50 mL) was added and the suspension stirred for 10 min. The suspension was concentrated in vacuo to provide methyl 2-((4-fluoro-[1,1-biphenyl])-4-sulfonamido)-5-formylbenzoate, which was used in the subsequent step without further purification. MS (ESI) m/z: 414.2 [M+H.sup.+]. .sup.1H NMR (500 MHz, CDCl.sub.3) =11.22 (br s, 1H), 9.89 (s, 1H), 8.49 (s, 1H), 8.09-7.92 (m, 3H), 7.87 (d, J=8.9 Hz, 1H), 7.65 (br d, J=8.2 Hz, 2H), 7.53 (br dd, J=5.3, 8.4 Hz, 2H), 7.15 (t, J=8.5 Hz, 2H), 3.98 (s, 3H).

[0280] The following intermediates of the present disclosure were made using the methods described for Intermediate 13 above, and substituting the appropriate reactants and/or reagents:

TABLE-US-00004 Intermediate Structure Int-14 [00044] Int-15 [00045]

Example 1

Preparation of Compound 1

##STR00046##

Step 1: diethyl-(2-amino-5-nitrophenyl)phosphonate (1b)

##STR00047##

[0281] 2-iodo-4-nitroaniline (1.0 g, 3.79 mmol), triethyl phosphite (1.26 g, 7.58 mmol) and Pd(OAc).sub.2 (170 mg, 0.758 mmol) were combined in MeCN (10 mL) in a microwave tube. The vessel was sealed, and irradiated at 120 C. for 1.5 h. The reaction mixture was concentrated in vacuo and the resulting residue was purified by column chromatography on SiO.sub.2 [Isco; Agela Flash Column Silica-CS (4 g), eluent of 0 to 40% EtOAc/Pet. ether at 30 mL/min] to provide diethyl-(2-amino-5-nitrophenyl)-phosphonate. .sup.1H NMR (400 MHz, CDCl.sub.3) (ppm) 8.36 (dd, J=2.8, 15.6 Hz, 1H), 8.11 (dd, J=2.4, 9.2 Hz, 1H), 6.66 (dd, J=6.8, 9.2 Hz, 1H), 4.17-4.11 (m, 4H), 1.37-1.33 (m, 6H).

Step 2: diethyl (2-((4-butylphenyl)sulfonamido)-5-nitrophenyl)phosphonate (1c)

##STR00048##

[0282] To a solution of diethyl (2-amino-5-nitrophenyl)phosphonate (1b; 1.0 g, 3.65 mmol) in THF (15 mL) at 0 C. was added NaH (0.365 g, 9.12 mmol, 60% in oil). The reaction mixture was stirred at 0 C. for 0.5 h and then a solution of 4-butylbenzene-1-sulfonyl chloride (Int-5) (1.018 g, 4.38 mmol) in THF (2 mL) was added. The reaction mixture was stirred at room temperature for 12 h. The reaction was quenched with sat. aq. NH.sub.4Cl (100 mL), extracted with EtOAc (2100 mL), and the organics were dried over Na.sub.2SO.sub.4, filtered, and concentrated in vacuo. The resulting residue was purified by column chromatography on SiO.sub.2 [Isco, Agela Flash 4 g Column, eluent of 0 to 30% EtOAc/Pet. ether at 30 mL/min] to provide diethyl (2-(4-butylphenylsulfonamido)-5-nitrophenyl)phosphonate. MS (ESI, m/z): 471.1 [M+H.sup.+].

Step 3: diethyl (5-amino-2-((4-butylphenyl)sulfonamido)phenyl)phosphonate (1d)

##STR00049##

[0283] To a solution of diethyl (2-(4-butylphenylsulfonamido)-5-nitrophenyl)phosphonate (1c; 1.2 g, 2.55 mmol) in MeOH (30 mL) was added 10% Pd/C (0.543 g, 0.510 mmol) at room temperature. The reaction mixture was purged with H.sub.2 with stirring and then stirred at room temperature under a H.sub.2 balloon for 13 h. The reaction mixture was filtered, and the filtrate was concentrated in vacuo. The resulting residue was purified by column chromatography on SiO.sub.2 [Isco; Agela Flash Column Silica-CS (4 g), eluent of 0 to 40% EtOAc/Pet. ether at 30 mL/min] to provide diethyl (5-amino-2-(4-butylphenyl-sulfonamido)phenyl)phosphonate. MS (ESI, m/z): 441.1. [M+H.sup.+]. .sup.1H NMR (500 MHz, CDCl.sub.3) (ppm) 9.67 (s, 1H), 7.74-7.64 (m, 3H), 7.19 (d, J=8.0 Hz, 2H), 6.84 (dd, J=2.8, 8.8 Hz, 1H), 6.73 (dd, J=2.8, 15.2 Hz, 1H), 3.75-3.67 (m, 4H), 2.59 (t, J=7.6 Hz, 2H), 1.57-1.51 (m, 2H), 1.33-1.30 (m, 2H), 1.20 (t, J=7.2 Hz, 6H), 0.91 (t, J=7.2 Hz, 3H).

Step 4: (5-amino-2-((4-butylphenyl)sulfonamido)phenyl)phosphonic acid (1e)

##STR00050##

[0284] To a solution of diethyl (5-amino-2-(4-butylphenylsulfonamido)phenyl)phosphonate (1d; 500 mg, 1.135 mmol) in DCE (10 mL) was added TMSBr (1738 mg, 11.35 mmol) at room temperature. The reaction was stirred at 50 C. for 15 h, concentrated in vacuo, and the resulting residue was suspended in H.sub.2O (15 mL). The precipitate was collected by centrifugation, washed with H.sub.2O (215 mL) and EtOAc (215 mL), and dried in vacuo to provide (5-amino-2-(4-butylphenyl-sulfonamido)phenyl)phosphonic acid, which was used in the subsequent step without further purification. MS (ESI, m/z): 385.0 [M+H.sup.+]. .sup.1H NMR (400 MHz, CD.sub.3OD) ppm 7.82 (d, J=8.4 Hz, 2H), 7.72 (dd, J=6.0, 8.8 Hz, 1H), 7.60 (dd, J=2.4, 14.4 Hz, 1H), 7.37-7.29 (m, 3H), 2.64 (t, J=7.6 Hz, 2H), 1.57 (td, J=7.6, 15.3 Hz, 2H), 1.37-1.29 (m, 2H), 0.92 (t, J=7.2 Hz, 3H).

Step 5: (2-((4-butylphenyl)sulfonamido)-5-(4-((4-((4-butylphenyl)sulfonamido)-3-(methoxycarbonyl)phenyl)amino)-4-oxobutanamido)phenyl)phosphonic acid (If)

##STR00051##

[0285] To a solution of 4-((4-(4-butylphenylsulfonamido)-3-(methoxycarbonyl)phenyl)amino)-4-oxobutanoic acid (Int-7; 50 mg, 0.108 mmol) and (5-amino-2-(4-butylphenyl-sulfonamido)-phenyl) phosphonic acid (1e; 42 mg, 0.109 mmol) in DMF (2 mL), was added HATU (42 mg, 0.110 mmol) and DIEA (0.057 mL, 0.325 mmol) at room temperature. The reaction was stirred at 35 C. for 15 h and then purified directly by reverse phase HPLC chromatography [Gilson 281, YMC-Actus Triart column (150*30 mm, 5 m), eluent of Mobile Phase A: H.sub.2O (0.1% TFA) and Mobile Phase B: MeCN at 220 nm] to provide (2-(4-butylphenylsulfonamido)-5-(4-((4-(4-butylphenylsulfonamido)-3-(methoxy-carbonyl)phenyl)amino)-4-oxobutanamido)-phenyl)phosphonic acid. MS (ESI, m/z): 829.3 [M+H.sup.+]. .sup.1H NMR (400 MHz, CD.sub.3OD) (ppm) 8.14 (s, 1H), 7.86 (br d, J=16.8 Hz, 1H), 7.48-7.79 (m, 8H), 7.28 (br d, J=5.6 Hz, 4H), 3.81 (s, 3H), 2.58-2.73 (m, 8H), 1.57 (br t, J=7.2 Hz, 4H), 1.25-1.36 (m, 4H), 0.91 (t, J=7.2 Hz, 6H).

Step 5: 2-((4-butylphenyl)sulfonamido)-5-(4-((4-((4-butylphenyl)sulfonamido)-3-phosphonophenyl)amino)-4-oxobutanamido)benzoic acid (1)

##STR00052##

[0286] To a solution of (2-(4-butylphenylsulfonamido)-5-(4-((4-(4-butylphenylsulfonamido)-3-(methoxycarbonyl)phenyl)amino)-4-oxobutanamido)phenyl)phosphonic acid (4f; 15 mg, 0.018 mmol) in DMF (0.5 mL) was added LiI (5 mg, 0.037 mmol) at room temperature. The resulting reaction mixture was stirred at 130 C. for 15 h then purified directly by reverse phase HPLC chromatography [ACSSH-CK, Phenomenex Gemini-NX column (150*30 mm, 5 m), eluent of Mobile Phase A: H.sub.2O (0.05% ammonium hydroxide) and Mobile Phase B: MeCN at 220 nm] to provide Compound 1. .sup.1H NMR (400 MHz, CD.sub.3OD) (ppm) 7.81 (br d, J=8.4 Hz, 3H), 7.42-7.73 (m, 7H), 7.25 (dd, J=14.4, 8.19 Hz, 4H), 2.54-2.71 (m, 8H), 1.48-1.62 (m, 4H), 1.31 (dquin, J=14.4, 7.2, 7.2, 7.2, 7.2 Hz, 4H), 0.90 (td, J=7.2, 2.93 Hz, 6H).

Example 2

Preparation of Compound 2

##STR00053##

Step 1: dimethyl 5,5-(succinylbis(azanediyl))bis(2-((4-butylphenyl)sulfonamido)benzoate) (2a)

##STR00054##

[0287] To a solution of methyl 5-amino-2-((4-butylphenyl)sulfonamido)benzoate (Int-6; 2.070 g, 5.71 mmol) and N,N-dimethylpyridin-4-amine (0.066 g, 0.542 mmol) in pyridine was added succinyl dichloride (0.426 ml, 3.87 mmol) in CH.sub.2Cl.sub.2 (3 mL). The reaction was stirred at room temperature for 15 h and then concentrated in vacuo to provide the crude dimethyl 5,5-(succinylbis(azanediyl))bis(2-((4-butylphenyl)-sulfonamido)benzoate), which was used in the subsequent step without further purification. MS (ESI, m/z): 807.3 [M+H.sup.+].

Step 2: 5,5-(succinylbis(azanediyl))bis(2-((4-butylphenyl)sulfonamido)benzoic acid) (2)

##STR00055##

[0288] To a solution of 5,5-(succinylbis(azanediyl))bis(2-((4-butylphenyl)sulfonamido)benzoate) (2a; 3 g, 3.72 mmol) in THF (25 ml) and MeOH (25 mL) was added 1 M lithium hydroxide hydrate (14.87 mL, 14.87 mmol) at room temperature. The reaction was heated to 45 C. and stirred for 15 h, concentrated in vacuo, and the resulting residue was purified directly by reverse phase HPLC chromatography [Sunfire C18 column, (250*15 mm), eluent of Mobile Phase A: H.sub.2O (0.1% TFA) and Mobile Phase B: MeCN at 220 nm] to provide Compound 2. MS (ESI, m/z): 779.3 [MH.sup.+]. .sup.1H NMR (500 MHz, CD.sub.3OD) (ppm) 8.14 (s, 2H), 7.70-7.71 (m, 2H), 7.60-7.69 (m, 6H), 7.27 (d, J=8.5 Hz, 4H), 2.69 (s, 4H), 2.61-2.64 (m, 4H), 1.52-1.57 (m, 4H), 1.27-1.32 (m, 4H), 0.90 (t, J=7.5 Hz, 6H).

Example 3

Preparation of Compound 3

##STR00056##

Step 1: methyl 2-((4-butylphenyl)sulfonamido)-5-nitronicotinate (3a)

##STR00057##

[0289] To a solution of methyl 2-amino-5-nitronicotinate (200 mg, 1.014 mmol) in THF (5072 L) was added NaH (81 mg, 2.029 mmol) and the reaction was stirred at room temperature for 15 min. 4-Butylbenzene-1-sulfonyl chloride (Int-5, 246 L, 1.268 mmol) was added and the reaction mixture was stirred at room temperature for 15 min. The reaction mixture was diluted with H.sub.2O (10 mL) and extracted with EtOAc (350 mL). The organics were dried over anh. Mg.sub.2SO.sub.4, filtered, and concentrated in vacuo. The resulting residue was purified by flash chromatography on SiO.sub.2 [Isco, Gold Redisep 12 g column, eluent of 0 to 50% EtOAc in hexanes] followed by preparative reverse phase chromatography [C18 column, Mobile Phase A: H.sub.2O (0.1% TFA) and Mobile Phase B: MeCN] to provide methyl 2-((4-butylphenyl)-sulfonamido)-5-nitronicotinate. MS (ESI, m/z): 394.2 [M+H.sup.+].

Step 2: methyl 5-amino-2-((4-butylphenyl)sulfonamido)nicotinate (3b)

##STR00058##

[0290] To a solution of methyl 2-((4-butylphenyl)sulfonamido)-5-nitronicotinate (3a; 120 mg, 0.305 mmol) in EtOH (6.1 mL) was added 10% Pd/C, wet (32.5 mg, 0.031 mmol). The vessel was evacuated and back-filled with N.sub.2 (3) and then evacuated and back-filled with H.sub.2 (3). The reaction was stirred under a H.sub.2 balloon at room temperature for 1.5 h. The reaction mixture was filtered over Celite and washed with EtOAc (520 mL). The filtrate was concentrated in vacuo to provide crude methyl 5-amino-2-((4-butylphenyl)sulfonamido)nicotinate, which was used in the subsequent step without further purification. MS (ESI, m/z): 364.2 [M+H.sup.+].

Step 3: 2-((4-butylphenyl)sulfonamido)-5-(4-((4-((4-butylphenyl)sulfonamido)-3-carboxyphenyl)amino)-4-oxobutanamido)nicotinic acid (3c)

##STR00059##

[0291] A solution of 4-((4-((4-butylphenyl)sulfonamido)-3-(methoxycarbonyl)phenyl)amino)-4-oxobutanoic acid (Int-7; 20 mg, 0.043 mmol), methyl 5-amino-2-((4-butylphenyl)-sulfonamido)nicotinate (3b; 15.72 mg, 0.043 mmol), TCFH (14.56 mg, 0.052 mmol), and 1-methylimidazole (12.01 L, 0.151 mmol) in CH.sub.2Cl.sub.2 (432 L) was stirred at room temperature for 1.5 h. The reaction mixture was diluted with aq. sodium bicarbonate (10 mL) and extracted with CH.sub.2Cl.sub.2 (320 mL). The organics were dried over anh. Mg.sub.2SO.sub.4, filtered, and concentrated in vacuo. The resulting residue was purified by preparative reverse phase chromatography [C18 column, eluent of mobile phase A: water (0.1% TFA) and mobile phase B: MeCN at 220 nm] to provide 2-((4-butylphenyl)-sulfonamido)-5-(4-((4-((4-butylphenyl)sulfonamido)-3-carboxyphenyl)amino)-4-oxo-butanamido)nicotinic acid. MS (ESI, m/z): 808.5 [M+H.sup.+].

Step 4: 5,5-(succinylbis(azanediyl))bis(2-((4-butylphenyl)sulfonamido)benzoic acid) (3)

##STR00060##

[0292] To a solution of methyl 2-((4-butylphenyl)sulfonamido)-5-(4-((4-((4-butylphenyl)-sulfonamido)-3-(methoxycarbonyl)phenyl)amino)-4-oxobutanamido)nicotinate (3c; 20.8 mg, 0.026 mmol) in THF (211 L), water (211 L), and MeOH (211 L) was added lithium hydroxide hydrate (6.17 mg, 0.257 mmol). The reaction mixture was stirred at room temperature for 4 h then concentrated in vacuo. The resulting residue was purified by preparative reverse phase chromatography [C18 column, Mobile Phase A: H.sub.2O (0.1% TFA) and Mobile Phase B: MeCN] to provide Compound 3. MS (ESI, m/z): 780.4 [M+H.sup.+]. .sup.1H NMR (500 MHz, DMSO) (ppm) 8.49 (s, 2H), 8.15 (s, 1H), 7.92 (d, J=7.5 Hz, 2H), 7.71 (d, J=6.9 Hz, 1H), 7.63 (d, J=8.2 Hz, 2H), 7.47 (d, J=8.9 Hz, 1H), 7.36 (dd, J=19.0, 8.0 Hz, 4H), 2.69-2.56 (m, 4H), 1.52 (dt, J=16.6, 7.8 Hz, 3H), 1.34-1.20 (m, 3H), 1.09 (t, J=7.0 Hz, 6H), 0.86 (dt, J=11.3, 7.4 Hz, 6H).

Example 4

Preparation of Compound 4

##STR00061##

Step 1: Methyl 2-amino-5-(4-(tert-butoxy)-4-oxobutoxy)benzoate (4a)

##STR00062##

[0293] A solution of methyl 2-amino-5-hydroxybenzoate (4.00 g, 23.9 mmol) in MeCN (72.5 ml) was treated with tert-butyl 4-bromobutanoate (4.62 mL, 26.1 mmol) and K.sub.2CO.sub.3 (powder, 4.51 g, 32.6 mmol) and then heated at reflux for 18 h, stirring rapidly. The reaction was diluted with water and extracted with EtOAc (2). The organics were washed with brine, dried over MgSO.sub.4, filtered, and concentrated in vacuo. The resulting residue was purified by flash chromatography on SiO.sub.2 [Isco 120 g Gold column, eluent of 0 to 25% EtOAc/hexanes] to provide methyl 2-amino-5-(4-(tert-butoxy)-4-oxobutoxy)benzoate. MS (ESI, m/z): 310.4 [M+H.sup.+]. .sup.1H NMR (500 MHz, CDCl.sub.3) (ppm) 7.36 (d, J=3.0 Hz, 1H), 6.95-6.97 (m, 1H), 6.64 (d, J=9.0 Hz, 1H), 5.44 (br s, 2H), 3.93-3.96 (m, 2H), 3.89 (s, 3H), 2.43 (t, J=7.5 Hz, 2H), 2.02-2.07 (m, 2H), 1.47 (s, 9H).

Step 2: 2,2,2-Trifluoroacetic acid-4-(4-amino-3-(methoxycarbonyl)phenoxy)butanoic acid (4b)

##STR00063##

[0294] A solution of methyl 2-amino-5-(4-(tert-butoxy)-4-oxobutoxy)benzoate (4a) (3.14 g, 10.2 mmol) in CH.sub.2Cl.sub.2 (51 ml) was treated with TFA (19.6 ml, 254 mmol) via steady stream at room temperature and stirred for 2 h. The reaction was concentrated in vacuo and then dried under high vacuum for several hours to provide 2,2,2-trifluoroacetic acid-4-(4-amino-3-(methoxycarbonyl)phenoxy)butanoic acid, which was used in the subsequent step without further purification. MS (ESI, m/z): 254.3 [M+H.sup.+]. .sup.1H NMR (500 MHz, CDCl.sub.3) (ppm) 7.62 (d, J=2.5 Hz, 1H), 7.45 (d, J=8.5 Hz, 1H), 7.17 (d, J=9.0 Hz, 1H), 4.11 (t, J=6.0 Hz, 2H), 4.03 (s, 3H), 2.66 (t, J=7.0 Hz, 2H), 2.17-2.22 (m, 2H).

Step 3: Methyl 2-amino-5-(4-(4-amino-3-methoxycarbonyl)phenoxy)butanamido)benzoate (4c)

##STR00064##

[0295] A mixture of 2,2,2-trifluoroacetic acid-4-(4-amino-3-(methoxycarbonyl)-phenoxy)-butanoic acid (4b; 3.73 g, 10.2 mmol) and methyl 2,5-diaminobenzoate (2.40 g, 14.4 mmol) in CH.sub.2Cl.sub.2 (85 ml) was treated with 1-methylimidazole (2.83 mL, 35.5 mmol). After 5 mins, 3 portions of chloro-N,N,N,N-tetramethylformamidinium hexafluorophosphate (3.36 g, 12.0 mmol) were added at room temperature. The reaction was stirred overnight and then treated with additional CH.sub.2Cl.sub.2 (40 ml), methyl 2,5-diaminobenzoate (1.00 g), and 1-methylimidazole (2.8 mL). After stirring for several minutes, additional chloro-N,N,N,N-tetramethylformamidinium hexafluorophosphate (2.3 g) was added and the reaction was stirred overnight. The reaction was diluted with water then extracted with CH.sub.2Cl.sub.2 (2100 mL). The combined organic layers were washed with brine, dried over anh. MgSO.sub.4, filtered, and concentrated in vacuo. The resulting residue was purified by flash chromatography on SiO.sub.2 [Isco 120 g Gold column, eluent of 0 to 70% (3:1 EtOAc:EtOH)/hex] to provide methyl 2-amino-5-(4-(4-amino-3-methoxycarbonyl)-phenoxy)butanamido)benzoate. MS (ESI, m/z): 402.5 [M+H.sup.+]. .sup.1H NMR (500 MHz, CDCl.sub.3) (ppm) 7.94 (d, J=2.5 Hz, 1H), 7.40 (dd, J=6.5, 3.0 Hz, 1H), 7.32 (d, J=3.0 Hz, 1H), 6.96 (dd, J=9.0, 3.0 Hz, 1H), 6.73 (apparent dd, J=9.0, 5.5 Hz, 2H), 3.97 (t, J=6.5 Hz, 2H), 3.82-3.87 (m, 7H), 3.33 (br s, 4H), 2.52 (t, J=7.0 Hz, 2H), 2.09-2.17 (m, 2H).

Step 4: 5-(4-(3-Carboxy-4-((5-(4-chlorophenyl)thiophene)-2-sulfonamido)phenoxy)-butanamido)-2-((5-(4-chlorophenyl)thiophene)-2-sulfonamido)benzoic acid (4)

##STR00065##

[0296] Methyl 2-amino-5-(4-(4-amino-3-(methoxycarbonyl)phenoxy)butanamido)benzoate (4c; 25 mg, 0.062 mmol) in pyridine (415 L) was added to methyl 2-amino-5-(4-(4-amino-3-(methoxycarbonyl)phenoxy)butanamido)benzoate (25 mg, 0.062 mmol) in pyridine (415 L) at room temperature. The reaction was stirred overnight, concentrated under a stream of nitrogen, then dissolved in 90% THF in MeOH (850 L) and treated with LiOH (5.5 M aq., 340 L). The reaction was stirred overnight open to air, then concentrated in vacuo, dissolved in DMSO and water, and filtered. The resulting residue was purified by preparative HPLC [Sunfire Prep C18 OBD 5 um (30150 mm), eluent of 10-100% MeCN (+0.1% TFA)/H.sub.2O (+0.1% TFA)] to provide Compound 4. MS (ESI, m/z): 886.7 [M+H.sup.+]. .sup.1H NMR (500 MHz, CD.sub.3OD) (ppm) 8.21 (d, J=2.5 Hz, 1H), 7.74 (dd, J=9.0, 2.5 Hz, 1H), 7.68-7.71 (m, 1H). 7.62 (d, J=9.0 Hz, 1H), 7.51-7.55 (m, 4H), 7.43-7.47 (m, 2H), 7.7.34-7.38 (m, 5H), 7.28 (d, J=4.0 Hz, 1H), 7.22 (d, J=4.0 Hz, 1H), 7.12 (dd, J 9.0, 3.5 Hz, 1H), 4.03 (t, J=6.0 Hz, 2H), 2.51 (t, J=7.0 Hz, 2H), 2.09-2.14 (m, 2H).

[0297] The following compounds, 5 through 13, of the present disclosure were made using the methods described in Example 4 above, and substituting the appropriate reactants and/or reagents:

TABLE-US-00005 Observed Compound Structure MS 5 [00066] 897.9 6 [00067] 848.2 7 [00068] 859.7 8 [00069] 807.5 9 [00070] 907.1 10 [00071] 767.3 11 [00072] 826.1 12 [00073] 826.1 13 [00074] 781.2

Example 5

Preparation of Compound 14

##STR00075##

Step 1: methyl 2-((1-(4-fluorophenyl)-JH-pyrazole)-4-sulfonamido)-5-(3-(4-((1-(4-fluorophenyl)-1H-pyrazole)-4-sulfonamido)-3-(methoxycarbonyl)phenyl)ureido) benzoate (14a)

##STR00076##

[0298] To a stirred mixture of methyl 5-amino-2-((1-(4-fluorophenyl)-1H-pyrazole)-4-sulfonamido)benzoate (Int-11; 100 mg, 0.256 mmol) in THF (10 mL) were added CDI (41.5 mg, 0.256 mmol) and TEA (0.107 mL, 0.768 mmol) at room temperature. The reaction was stirred at 50 C. for 14 h then concentrated in vacuo, and the resulting residue was purified by reverse phase chromatography [Phenomenex Synergi C18 column (100 mm*21.2 mm, 4 m), eluent of mobile phase A: water (0.1% TFA) and mobile phase B: MeCN at 220 nm] to provide methyl 2-((1-(4-fluorophenyl)-1H-pyrazole)-4-sulfonamido)-5-(3-(4-((1-(4-fluorophenyl)-1H-pyrazole)-4-sulfonamido)-3(methoxycarbonyl)phenyl)ureido)benzoate. MS (ESI) m/z: 807.1 [M+H.sup.+].

Step 2: 5-(3-(3-carboxy-4-((1-(4-fluorophenyl)-1H-pyrazole)-4-sulfonamido)phenyl) ureido)-2-((1-(4-fluorophenyl)-1H-pyrazole)-4-sulfonamido)benzoic acid (14)

##STR00077##

[0299] To a solution of methyl 2-((1-(4-fluorophenyl)-1H-pyrazole)-4-sulfonamido)-5-(3-(4-((1-(4-fluorophenyl)-1H-pyrazole)-4-sulfonamido)-3-(methoxycarbonyl)phenyl)ureido)-benzoate (14a; 50 mg, 0.062 mmol) in THF (2 mL), MeOH (2 mL) and H.sub.2O (1 mL) was added lithium hydroxide monohydrate (2.60 mg, 0.062 mmol) at room temperature. The reaction mixture was stirred at 40 C. for 14 h. Dilute hydrochloric acid was added to pH 7 (weakly acidic). The reaction mixture was concentrated in vacuo and the resulting residue was purified by reverse phase chromatography [Phenomenex Synergi C18 column (150 mm*30 mm, 4 m), eluent of mobile phase A: water (0.05% HCl) and mobile phase B: MeCN at 220 nm] to provide Compound 14. MS (ESI) m/z: 777.0 [MH.sup.+]. .sup.1H NMR (500 MHz, CD.sub.3OD) ppm 8.63 (s, 2H), 8.05 (s, 2H), 7.81 (s, 2H), 7.75-7.67 (m, 8H), 7.21 (t, J=8.5 Hz, 4H).

[0300] The following compounds 15 and 16 of the present disclosure were made using the methods described in Example 5 above, and substituting the appropriate reactants and/or reagents:

TABLE-US-00006 Observed Compound Structure MS 15 [00078] 723.4 16 [00079] 766.1

Example 6

Preparation of Compound 17

##STR00080##

Step 1: methyl 2-(2-((4-chlorobenzyl)amino)-2-oxoacetamido)-5-nitrobenzoate (17a)

##STR00081##

[0301] To a stirred mixture of 2-((4-chlorobenzyl)amino)-2-oxoacetic acid (700 mg, 3.28 mmol) in CH.sub.2Cl.sub.2 (15 mL) were added methyl 2-amino-5-nitrobenzoate (707 mg, 3.60 mmol), NMI (538 mg, 6.55 mmol), and TCFH (1103 mg, 3.93 mmol) at room temperature. The reaction mixture was stirred at 60 C. for 15 h and then filtered. The filtrate was concentrated in vacuo to provide the crude methyl 2-(2-((4-chlorobenzyl)amino)-2-oxoacetamido)-5-nitrobenzoate, which was used in the subsequent step without further purification. MS (ESI) m/z: 392.2 [M+H.sup.+].

Step 2: methyl 5-amino-2-(2-((4-chlorobenzyl)amino)-2-oxoacetamido)benzoate (17b)

##STR00082##

[0302] To a solution of methyl 2-(2-((4-chlorobenzyl)amino)-2-oxoacetamido)-5-nitrobenzoate (17a; 600 mg, 1.532 mmol) in MeOH (2 mL), THF (2 mL), and H.sub.2O (1 mL) were added NH.sub.4Cl (819 mg, 15.32 mmol) and iron (855 mg, 15.32 mmol). The reaction mixture was stirred at 60 C. for 5 h, then H.sub.2O (10 mL) was added and the resulting mixture was extracted with EtOAc (310 mL). The organics were washed with brine (10 mL), dried over anh. Na.sub.2SO.sub.4, filtered, and the filtrate was concentrated in vacuo to provide crude methyl 5-amino-2-(2-((4-chlorobenzyl)amino)-2-oxoacetamido)benzoate, which was used in the subsequent step without further purification. MS (ESI) m/z: 362.2 [M+H.sup.+].

Step 3: dimethyl 5,5-(carbonylbis(azanediyl))bis(2-(2-((4-chlorobenzyl)amino)-2-oxoacetamido)benzoate) (17c)

##STR00083##

[0303] To a solution of methyl 5-amino-2-(2-((4-chlorobenzyl)amino)-2-oxoacetamido)benzoate (17b; 60 mg, 0.166 mmol) in pyridine (1 mL) was added phenyl chloroformate (10.47 L, 0.083 mmol). The reaction mixture was stirred at 80 C. for 5 h, then filtered, and the filtrate was concentrated in vacuo to provide crude dimethyl 5,5-(carbonylbis(azanediyl))bis-(2-(2-((4-chlorobenzyl)amino)-2-oxoacetamido)benzoate), which was used in the subsequent step without further purification. .sup.1H NMR (400 MHz, DMSO-d.sub.6) ppm 12.13 (s, 2H), 9.67 (br t, J=6.0 Hz, 2H), 9.03 (s, 2H), 8.52 (d, J=9.2 Hz, 2H), 8.30 (d, J=2.8 Hz, 2H), 7.64 (br dd, J=2.8, 9.2 Hz, 2H), 7.40-7.35 (m, 4H), 7.34-7.29 (m, 4H), 4.36 (br d, J=6.4 Hz, 4H), 3.89 (s, 6H).

Step 4: 5,5-(carbonylbis(azanediyl))bis(2-(2-((4-chlorobenzyl)amino)-2-oxoacetamido) benzoic acid) (17)

##STR00084##

[0304] To a solution of dimethyl 5,5-(carbonylbis(azanediyl))bis(2-(2-((4-chlorobenzyl)amino)-2-oxoacetamido)benzoate) (17c, 30 mg, 0.040 mmol) in THF (2 mL) was added potassium trimethylsilanolate (51.3 mg, 0.400 mmol) at room temperature. The reaction was stirred at room temperature for 5 h then acidified to pH=2 with 3 N HCl. The reaction mixture was concentrated in vacuo and the resulting residue was purified by reverse phase chromatography [Gilson 281, Phenomenex Synergi C18 column (150 mm*30 mm, 4 m), eluent of mobile phase A: water (0.05% HCl) and mobile phase B: MeCN at 220 nm] to provide Compound 17. MS (ESI) m/z: 719.1 [MH.sup.+]. .sup.1H NMR (400 MHz, DMSO-d.sub.6) ppm 12.41 (br s, 2H), 9.66-9.60 (m, 2H), 8.93 (br s, 2H), 8.56 (br d, J=9.2 Hz, 2H), 8.24 (br d, J=2.4 Hz, 2H), 7.66 (br d, J=8.8 Hz, 2H), 7.44-7.25 (m, 8H), 4.36 (br d, J=6.8 Hz, 4H).

[0305] The following compounds (18 and 19) of the present disclosure were made using the methods described in Example 6 above, and substituting the appropriate reactants and/or reagents:

TABLE-US-00007 Observed Compound Structure MS 18 [00085] 689.1 19 [00086] 749.1

Example 7

Preparation of Compound 20

##STR00087##

Step 1: benzyl 4-amino-3-bromobenzoate (20a)

##STR00088##

[0306] To a stirred solution of 4-amino-3-bromobenzoic acid (21.6 g, 100 mmol) in DMF (200 mL) were added K.sub.2CO.sub.3 (16.58 g, 120 mmol) followed by the dropwise addition of (bromomethyl)benzene (12.47 mL, 105 mmol) at room temperature. The reaction mixture was stirred at room temperature for 3 h, diluted with water (1 L), then extracted with EtOAc (3200 mL). The combined organics were dried over anh. Na.sub.2SO.sub.4, filtered, and concentrated in vacuo to afford the benzyl 4-amino-3-bromobenzoate, which was used in the subsequent step without further purification. .sup.1H NMR (400 MHz, CDCl.sub.3) ppm 8.18-8.12 (m, 1H), 7.87-7.79 (m, 1H), 7.47-7.31 (m, 5H), 6.74 (dd, J=2.8, 8.8 Hz, 1H), 5.33 (d, J=2.4 Hz, 2H), 4.32 (br s, 2H).

Step 2: benzyl 3-bromo-4-((4-butylphenyl)sulfonamido)benzoate (20b)

##STR00089##

[0307] To a stirred solution of 4-butylbenzene-1-sulfonyl chloride (Int-5, 1.5 g, 6.45 mmol) and DMAP (0.157 g, 1.289 mmol) in CH.sub.2Cl.sub.2 (20 mL) were added Pyridine (0.765 g, 9.67 mmol) and benzyl 4-amino-3-bromobenzoate (20a; 1.973 g, 6.45 mmol) at room temperature. The reaction mixture was stirred at 40 C. for 15 h, and then concentrated in vacuo. The resulting residue was purified by column chromatography on SiO.sub.2 [Isco; Agela 20 g Column Silica-CS, eluent of 0 to 10% EtOAc/Pet. ether gradient @30 mL/min] to provide benzyl 3-bromo-4-(4-butylphenylsulfonamido)benzoate. MS (ESI) m/z: 502.1, 504.1 [M+H.sup.+]. .sup.1H NMR (400 MHz, CDCl.sub.3) ppm 8.11 (d, J=1.6 Hz, 1H), 7.92 (dd, J=1.6, 8.8 Hz, 1H), 7.70 (d, J=8.0 Hz, 2H), 7.66 (d, J=8.8 Hz, 1H), 7.41-7.30 (m, 5H), 7.23 (br d, J=8.0 Hz, 2H), 5.29 (s, 2H), 2.60 (t, J=7.6 Hz, 2H), 1.54 (quin, J=7.6 Hz, 2H), 1.35-1.26 (m, 2H), 0.88 (t, J=7.2 Hz, 3H).

Step 3: 1-benzyl 3-methyl 4-((4-butylphenyl)sulfonamido)isophthalate (20c)

##STR00090##

[0308] To a stirred solution of benzyl 3-bromo-4-((4-butylphenyl)sulfonamido)benzoate (20b; 500 mg, 0.995 mmol) in DMSO (5 mL) and MeOH (5 mL) were added Pd(dppf)Cl.sub.2 (146 mg, 0.199 mmol) and Et.sub.3N (0.42 mL, 2.99 mmol) at room temperature. The reaction mixture was stirred at 70 C. under CO (50 psi) for 24 h. The reaction mixture was diluted with water (100 mL), extracted with EtOAc (215 mL), and the combined organics were dried over anh. Na.sub.2SO.sub.4, filtered, and concentrated in vacuo. The resulting residue was purified by column chromatography on SiO.sub.2 [Isco; Agela 4 g Column Silica-CS, eluent of 0 to 20% EtOAc/Pet. ether gradient @30 mL/min] to provide 1-benzyl 3-methyl 4-(4-butylphenylsulfonamido)isophthalate. MS (ESI) m/z: 482.2 [M+H.sup.+]. .sup.1H NMR (400 MHz, CD.sub.3OD) ppm 8.57 (d, J=2.0 Hz, 1H), 8.11 (dd, J=8.8, 2.0 Hz, 1H), 7.71-7.79 (m, 3H), 7.30-7.43 (m, 7H), 5.31 (s, 2H), 3.91 (s, 3H), 2.63 (t, J=7.6 Hz, 2H), 1.55 (quin, J=7.6 Hz, 2H), 1.26-1.33 (m, 2H), 0.86-0.91 (m, 3H).

Step 4: 4-((4-butylphenyl)sulfonamido)-3-(methoxycarbonyl)benzoic acid (20d)

##STR00091##

[0309] To a solution of 1-benzyl 3-methyl 4-(4-butylphenylsulfonamido)isophthalate (20c; 400 mg, 0.831 mmol) in MeOH (10 mL), was added Pd/C (50 mg, 0.047 mmol) at room temperature. The reaction flask was evacuated and back-filled with H.sub.2, and the reaction mixture was stirred under H.sub.2 (balloon) for 15 h. After filtration, the filtrate was concentrated under in vacuo to provide 4-(4-butylphenylsulfonamido)-3-(methoxycarbonyl)benzoic acid, which was used in the subsequent step without further purification. MS (ESI) m/z: 392.1 [M+H.sup.+]. .sup.1H NMR (400 MHz, CD.sub.3OD) S ppm 8.57 (d, J=2.0 Hz, 1H), 8.09 (dd, J=8.8, 2.0 Hz, 1H), 7.75 (dd, J=17.2, 8.4 Hz, 3H), 7.34 (d, J=8.4 Hz, 2H), 3.93 (s, 3H), 2.64 (t, J=7.6 Hz, 2H), 1.50-1.62 (m, 2H), 1.30 (dq, J=14.8, 7.2 Hz, 2H), 0.90 (t, J=7.2 Hz, 3H).

Step 5: methyl 5-(3-((tert-butoxycarbonyl)amino)propanamido)-2-((4-butylphenyl)-sulfonamido)benzoate (20e)

##STR00092##

[0310] To a stirred solution of 3-((tert-butoxycarbonyl)amino)propanoic acid (500 mg, 2.64 mmol), methyl 5-amino-2-(4-butylphenylsulfonamido) benzoate (Int-6; 1245 mg, 3.44 mmol) and NMI (759 mg, 9.25 mmol) in CH.sub.2Cl.sub.2 (10 mL), was added TCFH (853 mg, 3.04 mmol) at room temperature. The reaction mixture was stirred at room temperature for 4 h, concentrated in vacuo, and the resulting residue was purified by column chromatography on SiO.sub.2 [Isco; eluent of 50% EtOAc/Pet. ether @30 mL/min] to provide methyl 5-(3-((tert-butoxycarbonyl)amino) propanamido)-2-(4-butylphenylsulfonamido)benzoate. MS (ESI) m/z: 534.2 [M+H.sup.+]. .sup.1H NMR (400 MHz, CDCl.sub.3) ppm 8.34-8.09 (m, 2H), 7.74-7.60 (m, 3H), 7.54 (br d, J=9.2 Hz, 1H), 7.30-7.16 (m, 2H), 5.14 (br s, 1H), 3.82 (s, 3H), 3.45 (br d, J=5.6 Hz, 2H), 2.63-2.52 (m, 4H), 1.60-1.46 (m, 2H), 1.43-1.38 (m, 9H), 1.37-1.22 (m, 2H), 0.94-0.84 (m, 3H).

Step 6: methyl 5-(3-aminopropanamido)-2-((4-butylphenyl)sulfonamido)benzoate (20f)

##STR00093##

[0311] To a stirred solution of methyl 5-(3-((tert-butoxycarbonyl)amino)propanamido)-2-(4-butylphenylsulfonamido)benzoate (20e; 1.4 g, 2.62 mmol) in CH.sub.2Cl.sub.2 (12 mL), was added TFA (3 mL, 2.62 mmol) at room temperature. The reaction mixture was stirred at room temperature for 0.5 h and then concentrated in vacuo. The resulting residue was diluted with water (15 mL), extracted with EtOAc (310 mL), and the combined organics were dried over anh, Na.sub.2SO.sub.4, filtered, and concentrated in vacuo to provide crude methyl 5-(3-aminopropanamido)-2-(4-butylphenylsulfonamido)benzoate, which was used in the subsequent step without further purification. .sup.1H NMR (400 MHz, CDCl.sub.3) ppm 7.97 (s, 1H), 7.65 (br d, J=8.8 Hz, 2H), 7.54-7.50 (m, 1H), 7.26-7.24 (m, 1H), 7.18 (br d, J=8.8 Hz, 2H), 3.74-3.59 (m, 3H), 3.21 (br s, 2H), 2.73 (br s, 2H), 2.63-2.44 (m, 2H), 2.00-1.84 (m, 2H), 1.61-1.42 (m, 2H), 0.93-0.75 (m, 3H).

Step 7: methyl 2-((4-butylphenyl)sulfonamido)-5-(3-(4-((4-butylphenyl)sulfonamido)-3-(methoxycarbonyl)benzamido)propanamido)benzoate (20g)

##STR00094##

[0312] To a solution of methyl 5-(3-aminopropanamido)-2-((4-butylphenyl)sulfonamido)benzoate (20f; 300 mg, 0.692 mmol) in CH.sub.2Cl.sub.2 (4 mL) and DMF (4 mL), were added 4-((4-butylphenyl)sulfonamido)-3-(methoxycarbonyl)benzoic acid (20d; 271 mg, 0.692 mmol), HATU (276 mg, 0.727 mmol) and DIEA (0.363 ml, 2.076 mmol) at room temperature. The reaction mixture was stirred at 40 C. for 1 h, and then diluted with water (40 mL), and extracted with EtOAc (220 mL). The combined organics were dried over anh. Na.sub.2SO.sub.4, filtered, and concentrated in vacuo. The resulting residue was purified by column chromatography on SiO.sub.2 [Isco, Agela 12 g Column Silica-CS, eluent of 0 to 78% EtOAc/Pet. ether at 30 mL/min] to provide methyl 2-((4-butylphenyl)sulfonamido)-5-(3-(4-((4-butylphenyl)sulfonamido)-3-(methoxycarbonyl)-benzamido)propanamido)benzoate. MS (ESI) m/z: 807.3 [M+H.sup.+]. .sup.1H NMR (400 MHz, CD.sub.3OD) ppm 8.40 (d, J=2.4 Hz, 1H), 8.14 (d, J=2.8 Hz, 1H), 7.88-7.96 (m, 1H), 7.65-7.76 (m, 4H), 7.61 (d, J=8.8 Hz, 3H), 7.29 (dd, J=17.6, 8.4 Hz, 4H), 3.87-3.91 (m, 3H), 3.81 (s, 3H), 3.66 (t, J=6.8 Hz, 2H), 2.63 (br t, J=7.6 Hz, 6H), 1.51-1.61 (m, 4H), 1.27-1.36 (m, 4H), 0.90 (td, J=7.2, 2.4 Hz, 6H).

Step 8: 2-((4-butylphenyl)sulfonamido)-5-(3-(4-((4-butylphenyl)sulfonamido)-3-carboxy-benzamido)propanamido)benzoic acid (20)

##STR00095##

[0313] To a solution of methyl 2-((4-butylphenyl)sulfonamido)-5-(3-(4-((4-butylphenyl) sulfonamido)-3-(methoxycarbonyl)benzamido)propanamido)benzoate (20g; 290 mg. 0.359 mmol) in THF (8 mL), MeOH (8 mL) and water (4 mL), was added lithium hydroxide monohydrate (121 mg, 2.88 mmol) at room temperature. The reaction mixture was stirred at 40 C. for 15 h, and then acidified to pH=2 with 3N HCl. The combined solvents were removed in vacuo, and the resulting residue was purified by reverse phase chromatography [Gilson 281, Phenomenex Synergi C18, (100*21.2 mm), eluent of Mobile Phase A: water (0.1% TFA) and Mobile Phase B: MeCN at 220 nm] to provide Cerastecin C. MS (ESI) m/z: 777.3 [MH.sup.+]. .sup.1H NMR (400 MHz, CD.sub.3OD) ppm 8.44 (d, J=2.0 Hz, 1H), 8.15 (d, J=2.4 Hz, 1H), 7.88 (dd, J=8.8, 2.0 Hz, 1H), 7.56-7.78 (m, 7H), 7.26 (dd, J=16.8, 8.4 Hz, 4H), 3.65 (t, J=6.8 Hz, 2H), 2.51-2.72 (m, 6H), 1.52 (quin, J=7.6 Hz, 4H), 1.20-1.34 (m, 4H), 0.88 (t, J=7.2 Hz, 6H).

[0314] The following compounds (21-23) of the present disclosure were made using the methods described in Example 7 above, and substituting the appropriate reactants and/or reagents:

TABLE-US-00008 Observed Compound Structure MS 21 [00096] 781.3 22 [00097] 793.3 23 [00098] 866.9

[0315] Illustrative compounds of the present disclosure were tested in one or more of the above assays and results are provided in the table below:

Example 8

Target Identification by Isolation of Compound-Resistant Mutants

[0316] To identify the potential target of the claimed molecules mutants in A. baumannii were isolated as described here in Example 8 that are resistant to elevated concentrations of the test article. Briefly, rare, spontaneous resistant mutants were identified following growth of bacteria on solid growth media containing a test article. Colonies that grew in the presence of elevated concentrations of the test article were picked with a sterile loop and purified by restreaking on solid growth media containing the test article. Genomic DNA was purified from resistant isolates and subjected to whole genome sequencing. Following comparison of the genome sequences of resistant mutants to that of wild-type, parental strain using established computational sequence alignment, comparison and annotation methods, substitutions in the DNA sequence were observed that made nonsynonymous amino acid changes in the translated sequence of the MsbA open reading frame. An example of target identification by isolation and characterization of resistant mutants can be found in Howe, et al., Nature, 526(7575):672-7, 2015.

[0317] Target identification was done essentially as described previously with minor modifications (Howe, J. A., et al. Selective small-molecule inhibition of an RNA structural element. Nature (2015). 526: 672-7.). A. baumannii strain ATCC19606 (obtained from the American Type Culture Collection, www.atcc.org) was incubated overnight in cation-adjusted Mueller Hinton broth (CAMHB) at 37 C., 200 RPM to late-exponential phase (approximately 210.sup.9 colony forming units (cfu)/ml). One hundred l of the above culture was spread on each of CAMH agar plates containing 2-fold escalating liquid minimum inhibitory concentration (MIC) levels of compound. The plates were incubated at 37 C. for 48 hours. Resistant isolates that arose were counted and re-streaked on plates containing four-fold MIC concentration of respective compound. The frequency of resistance (FOR) was determined, dividing the number of resistant isolates by the viable cfu in the late-exponential inoculum. Genomic DNA from purified resistant isolates was prepared and subjected to whole genome sequencing. Polymorphism were identified in the resistant isolates by comparison to the wild-type parental strain. Analysis indicated single amino acid substitutions in MsbA were associated with resistance to examples of the claimed molecules.

Example 9

Antimicrobial Potency

[0318] The concentrations of compounds required to inhibit the growth of various strains of bacteria were determined in an assay that assessed bacterial growth by measuring optical density at 600 nm (OD600). Test articles were dissolved in 100% DMSO and serially diluted two-fold from their maximal concentration in 100% DMSO. Forty-nine l of bacterial inoculum (at approx. 210.sup.5 cfu/mL in CAMHB) were put into wells of an assay plate. One l of compound or DMSO was transferred from the source plate to the assay plate. The completed assay plates were then incubated at 352 degC. for 18-22 h. Bacterial growth was measured by reading OD600 on a spectrophotometer. Data analysis calculates the lowest concentration of compound which results in 95% growth inhibition (minimum inhibitory threshold concentration 95%, MITC95). Antimicrobial potency of test compounds was determined, and the results of that testing are shown in Table 1.

TABLE-US-00009 TABLE 1 Antibacterial assay 1.sup.a Compound (MITC95) 1 1560 nM 2 56.8 nM 3 621 nM 4 12.2 nM 5 12.2 nM 6 17.3 nM 7 12.2 nM 8 17.3 nM 9 12.2 nM 10 985 nM 11 48.9 nM 12 48.9 nM 13 97.8 nM 14 3130 nM 15 2210 nM 16 N/A 17 24.5 nM 18 N/A 19 >3130 nM 20 112 nM 21 782 nM 22 782 nM 23 98 nM N/A = data not available .sup.a= data generated using the assay described in Example 9

[0319] While the disclosure has been described and illustrated with reference to certain particular embodiments thereof, those skilled in the art will appreciate that various adaptations, changes, modifications, substitutions, deletions, or additions of procedures and protocols may be made without departing from the spirit and scope of the disclosure. For example, effective dosages other than the particular dosages as set forth herein above may be applicable as a consequence of variations in the responsiveness of the mammal being treated for any of the indications with the compounds of the disclosure indicated above. Likewise, the specific pharmacological responses observed may vary according to and depending upon the particular active compounds selected or whether there are present pharmaceutical carriers, as well as the type of formulation and mode of administration employed, and such expected variations or differences in the results are contemplated in accordance with the objects and practices of the present disclosure. It is intended, therefore, that the disclosure be defined by the scope of the claims which follow and that such claims be interpreted as broadly as is reasonable.