METHODS FOR PREPARING CDK4/6 INHIBITOR AND SALT AND INTERMEDIATE THEREOF

Abstract

The present invention relates to methods for preparing 5-fluoro-4-(7′-fluoro-2′-methylspiro[cyclopentane-1,3′-indol]-5′-yl)-N-(5-(1-methylpiperidin-4-yl)pyridin-2-yl)pyrimidin-2-amine and a salt and an intermediate thereof The methods provided herein have improved the existing synthesis methods, simplified the preparation process and increased the yield and purity, and can well meet the requirement of large-scale industrial manufacture.

Claims

1. A method for preparing a compound of formula (I), comprising: 1) reacting (4-bromo-2-fluorophenyl)hydrazine or a salt thereof with ##STR00028## to give a compound of formula ##STR00029## and 2. forming the compound of formula ##STR00030## using the compound of formula (IV).

2. The method according to claim 1, wherein the salt of (4-bromo-2-fluorophenyl) hydrazine in the step 1) is ##STR00031## sulfate of (4-bromo-2-fluorophenyl) hydrazine or p-toluenesulfonate of (4-bromo-2-fluorophenyl)hydrazine, preferably ##STR00032##

3. The method according to claim 1 or 2, wherein the step 1) is performed under basic or neutral conditions; and/or the step 2) is performed in the presence of an acid.

4. The method according to claim 3, wherein, the step 1) is performed in the presence of a base; the base is an inorganic base or an organic base, preferably an organic base, more preferably diisopropylethylamine, triethylamine, pyridine, piperidine or N,N-dimethylaminopiperidine, still more preferably diisopropylethylamine or triethylamine, and most preferably triethylamine; and/or the acid is an organic acid, an inorganic acid or a Lewis acid, preferably sulfuric acid, hydrochloric acid, phosphoric acid, methanesulfonic acid, ion exchange resin, p-toluenesulfonic acid, acetic acid, ZnCl.sub.2, FeCl.sub.3, AlCl.sub.3 or SnCl.sub.4; and/or a solvent of the step 1) and the step 2) is an alcohol, preferably a C.sub.1-C.sub.5 linear or branched alkanol, more preferably methanol, ethanol, propanol or isopropanol, and still more preferably methanol or ethanol.

5. The method according to any one of claims 1-4, further comprising: 3) extracting the compound of formula (I) obtained in the step 2) to give a crude product of the compound of formula (I).

6. The method according to claim 5, further comprising: 4) purifying the crude product of the compound of the formula (I) obtained in the step 3) by slurrying.

7. The method according to claim 6, wherein a solvent used for the slurrying is a nonpolar solvent, and the nonpolar solvent is preferably n-heptane or n-hexane.

8. A method for preparing a compound of formula (V), comprising: a) preparing a compound of formula (I) by the method according to any one of claims 1-7; and b) converting the compound of formula (I) to the compound of formula (V): ##STR00033##

9. The method according to claim 8, wherein the step b) comprises: (i) converting ##STR00034## and (ii) converting the ##STR00035## into the compound of formula ##STR00036##

10. The method according to claim 9, wherein the step (ii) further comprises crystallizing the compound of formula (V) after obtaining the compound of formula (V) by reaction.

11. The method according to claim 10, wherein a solvent used for the crystallizing is an alcohol or a ketone; preferably, the alcohol is a C.sub.1-C.sub.5 linear or branched alkanol; more preferably, the C.sub.1-C.sub.5 linear or branched alkanol is methanol, ethanol, propanol or isopropanol, further preferably methanol or ethanol; preferably, the ketone is acetone.

12. The method according to claim 10 or 11, further comprising treating the compound of formula (V) with activated carbon before crystallizing the compound of formula (V).

13. The method according to any one of claims 8-12, wherein the step (i) is performed in the presence of ##STR00037## and/or the step (ii) is performed in the presence of ##STR00038## wherein X in the ##STR00039## is chlorine, bromine or iodine, preferably chlorine.

14. The method according to claim 13, wherein a reaction solvent of the step (i) is isopropanol or dioxane; and/or a reaction solvent of the step (ii) is toluene or dioxane.

15. A method for preparing 2-amino-5-(1-methylpiperidin)pyridine of formula (VI), comprising: 1. reacting ##STR00040## with N-methyl-4-piperidone to give ##STR00041## 2. converting the ##STR00042## and 3. subjecting the ##STR00043## to hydrogenation reaction to give the compound of formula ##STR00044##

16. The method according to claim 15, wherein, the step 1) is performed in the presence of a Grignard reagent, an organolithium reagent or a combination thereof, preferably in the presence of a Grignard reagent and an organolithium reagent; preferably, the Grignard reagent is selected from one or more of methylmagnesium chloride, ethylmagnesium chloride, isopropylmagnesium chloride, methylmagnesium bromide, ethylmagnesium bromide and isopropylmagnesium bromide, and more preferably the Grignard reagent is isopropylmagnesium chloride or isopropylmagnesium bromide; and/or preferably, the organolithium reagent is selected from one or more of n-butyllithium, sec-butyllithium, tert-butyllithium, lithium bis(trimethylsilyl)amide (LiHMDS) and lithium diisopropylamide (LDA), and more preferably, the organolithium reagent is selected from n-butyllithium, sec-butyllithium and lithium diisopropylamide.

17. The method according to any one of claims 15-16, wherein a crude product of the compound obtained in the step 1) is purified by slurrying.

18. The method according to claim 17, wherein a solvent used for the slurrying is a combination of a nonpolar solvent and a polar solvent; preferably, the volume ratio of the nonpolar solvent to the polar solvent is 1:1; preferably, the nonpolar solvent is n-heptane or n-hexane; and/or preferably, the polar solvent is methyl tent-butyl ether.

19. The method according to any one of claims 15-18, wherein the step 2) is performed under acidic conditions; preferably, the step 2) is performed in the presence of an acid; preferably, the acid is selected from one or more of p-toluenesulfonic acid, p-toluenesulfonic acid monohydrate, trifluoroacetic acid, methanesulfonic acid and hydrochloric acid, and more preferably, the acid is p-toluenesulfonic acid or p-toluenesulfonic acid monohydrate.

20. The method according to any one of claims 15-19, wherein the pressure of the hydrogenation reaction in the step 3) is 0.1-10 MPa, preferably 0.5-2 MPa, and more preferably 1 MPa; and/or the step 3) is performed in the presence of a hydrogenation catalyst; preferably, the hydrogenation catalyst is selected from one or more of Pd/C, Pd(OH).sub.2, Raney nickel, platinum oxide and ammonium formate; preferably, the hydrogenation catalyst is Pd/C or Pd(OH).sub.2.

21. The method according to any one of claims 15-20, wherein a reaction solvent in the step 3) is an alcohol; preferably, the reaction solvent is selected from one or more of C.sub.1-C.sub.5 linear and branched alkanols; more preferably, the reaction solvent is selected from one or more of methanol, ethanol, propanol and isopropanol; especially preferably, the reaction solvent is ethanol or isopropanol.

22. A method for preparing a compound of formula (II), comprising: m) preparing a compound of formula (V) by the method according to any one of claims 8-14; and n) converting the compound of formula (V) into the compound of formula (II) ##STR00045##

23. The method according to claim 22, wherein the step n) is performed in the presence of a compound of formula (VI) ##STR00046## and a palladium catalyst; preferably, the palladium catalyst is Pd(dppf)Cl.sub.2, Pd(OAc).sub.2, PdCl.sub.2, Pd(PPh.sub.3).sub.2Cl.sub.2 or Pd.sub.2(dba).sub.3, and more preferably, the palladium catalyst is Pd(OAc).sub.2 or Pd.sub.2(dba).sub.3.

24. The method according to claim 23, wherein the compound of formula (VI) ##STR00047## is prepared via the method according to any one of claims 15-21.

25. The method according to any one of claims 22-23, wherein a solvent of the step n) is toluene, benzene or dioxane, preferably toluene.

26. The method according to any one of claims 22-25, wherein the step n) further comprises recrystallizing the compound of formula (II) to obtain a crude product of the compound of formula (II) after obtaining the compound of formula (II) by reaction.

27. The method according to claim 26, wherein solvents used for the recrystallizing comprise a first solvent and a second solvent, wherein the first solvent is toluene or dioxane, and the second solvent is a polar organic solvent; preferably, the second solvent is one or more of an alcohol, a ketone, a halogenated alkane, an ether and an ester; further preferably, the second solvent is one or more of a C.sub.1-C.sub.5 linear or branched alkanol, acetone, dichloromethane, chloroform, tetrahydrofuran and ethyl acetate; more preferably, the second solvent is one or more of methanol, dichloromethane, ethanol, propanol and isopropanol; most preferably, the second solvent is a combination of methanol and dichloromethane.

28. The method according to claim 26 or 27, wherein the step n) further comprises a step of removing palladium from the crude product of the compound of formula (II).

29. The method according to claim 28, wherein the step of removing palladium is performed in the presence of a metal scavenger, preferably in the presence of mercapto silica gel.

30. The method according to any one of claims 28-29, wherein the step n) further comprises a step of filtering resulting reaction solution and extracting resulting filtrate after the step of removing palladium; preferably, the step n) further comprises a step of crystallizing from extract liquid to give the compound of formula (II) or a step of recrystallizing to give the compound of formula (II) after the extracting is completed.

31. The method according to claim 30, wherein the filtrate is extracted with a polar organic solvent; preferably, the polar organic solvent is one or more of an alcohol, a ketone, a halogenated alkane, an ether and an ester; further preferably, the polar organic solvent is one or more of a C.sub.1-C.sub.5 linear or branched alkanol, acetone, dichloromethane, chloroform, tetrahydrofuran and ethyl acetate; more preferably, the polar organic solvent is one or more of methanol, dichloromethane, ethanol, propanol and isopropanol; most preferably, the polar organic solvent is a combination of methanol and dichloromethane; and/or a solvent used in the step of recrystallizing to give the compound of formula (II) is a combination of toluene and ethanol.

32. Fumarate of 5-fluoro-4-(7′-fluoro-2′-methylspiro[cyclopentane-1,3′-indol]-5′-yl)-N-(5-(1-methylpiperidin-4-yl)pyridin-2-yl)pyrimidin-2-amine, having a structure shown as formula (III) below: ##STR00048##

33. A method for preparing fumarate of 5-fluoro-4-(7′-fluoro-2′-methylspiro [cyclopentane-1,3′-indol]-5′-yl)-N-(5-(1-methylpiperidin-4-yl)pyridin-2-yl)pyrimidin-2-amine, comprising: reacting a compound of formula (II) with ##STR00049## to give a compound of formula (III), ##STR00050##

34. The method according to claim 33, wherein the compound of formula (II) is prepared by the method according to any one of claims 22-31.

35. The method according to claim 33 or 34, wherein the reaction is performed in an organic solvent or an aqueous solution of the organic solvent; preferably, the organic solvent is one or more of an alcohol, a ketone, a halogenated alkane, an ether, an ester and an aromatic hydrocarbon; further preferably, the organic solvent is one or more of an alcohol, a ketone, a halogenated alkane, an ether and an ester; more preferably, the organic solvent is one or more of a C.sub.1-C.sub.5 linear or branched alkanol, acetone, ethyl acetate, dichloromethane, chloroform, tetrahydrofuran and a C.sub.1-C.sub.6 linear or branched alkylbenzene; further more preferably, the organic solvent is one or more of a C.sub.1-C.sub.5 linear or branched alkanol, acetone, ethyl acetate, dichloromethane, chloroform and tetrahydrofuran; still more preferably, the organic solvent is one or more of methanol, ethanol, propanol, isopropanol, acetone, dichloromethane, chloroform, toluene and ethylbenzene; even more preferably, the organic solvent is one or more of methanol, ethanol, propanol, isopropanol, acetone, dichloromethane and chloroform; still even more preferably, the reaction solvent is one of ethanol and dichloromethane, a mixture of ethanol and dichloromethane, one of ethanol and toluene, or a mixture of ethanol and toluene.

36. The method according to any one of claims 33-35, further comprising crystallizing the compound of formula (III) after obtaining the compound of formula (III) by reaction; and/or adding fumaric acid dropwise slowly to the 5-fluoro-4-(7′-fluoro-2′-methylspiro [cyclopentane-1,3′-indol]-5′-yl)-N-(5-(1-methylpiperidin-4-yl)pyridin-2-yl)pyrimidin-2-amine while mixing the 5-fluoro-4-(7′-fluoro-2′-methylspiro[cyclopentane-1,3′-indol]-5′-yl)-N-(5-(1-methylpiperidin-4-yl)pyridin-2-yl)pyrimidin-2-amine with the fumaric acid; and/or reacting the 5-fluoro-4-(7′-fluoro-2′-methylspiro[cyclopentane-1,3′-indol]-5′-yl)-N-(5-(1-methylpiperidin-4-yl)pyridin-2-yl)pyrimidin-2-amine with the fumaric acid at a temperature between 20° C. to a temperature of reaction solvent reflux; and/or dissolving the 5-fluoro-4-(7′-fluoro-2′-methylspiro[cyclopentane-1,3′-indol]-5′-yl)-N-(5-(1-methylpiperidin-4-yl)pyridin-2-yl)pyrimidin-2-amine before reacting the 5-fluoro-4-(7′-fluoro-2′-methylspiro[cyclopentane-1,3′-indol]-5′-yl)-N-(5-(1-methylpiperidin-4-yl)pyridin-2-yl)pyrimidin-2-amine with the fumaric acid, wherein preferably, solvents used for dissolving the 5-fluoro-4-(7′-fluoro-2′-methylspiro [cyclopentane-1,3′-indol]-5′-yl)-N-(5-(1-methylpiperidin-4-yl)pyridin-2-yl)pyrimidin-2-amine comprise a third solvent and a fourth solvent, wherein the third solvent is one or more of a ketone, an ether, an ester and an alcohol, preferably one or more alcohols, more preferably one or more of C.sub.1-C.sub.5 linear and branched alkanols, and especially preferably one or more of methanol, ethanol, propanol and isopropanol; the fourth solvent is toluene, dichloromethane, chloroform or any combination thereof; preferably, the fourth solvent is dichloromethane, chloroform or a combination thereof; preferably, the fourth solvent is toluene, dichloromethane or a combination thereof; preferably, the fourth solvent is toluene or dichloromethane; preferably, the mixing volume ratio of the third solvent to the fourth solvent is 1:(0.1-10), preferably 1:(1-3), and most preferably 1:1; and/or distilling out the solvents used for dissolving the 5-fluoro-4-(7′-fluoro-2′-methylspiro [cyclopentane-1,3′-indol]-5′-yl)-N-(5-(1-methylpiperidin-4-yl)pyridin-2-yl)pyrimidin-2-amine before reacting the 5-fluoro-4-(7′-fluoro-2′-methylspiro[cyclopentane-1,3′-indol]-5′-yl)-N-(5-(1-methylpiperidin-4-yl)pyridin-2-yl)pyrimidin-2-amine with the fumaric acid.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0062] FIG. 1 is HPLC chromatogram for compound 3.

[0063] FIG. 2 is HPLC chromatogram for compound 7, wherein PH-GLY-GLR2007-237FA-7 represents compound 7, and PH-GLY-GLR2007-237FA-5 represents compound 5.

[0064] FIG. 3 is .sup.1H-NMR graph of 2-Boc-amino-5-(4-hydroxy-1-methylpiperidin)pyridine (PH-GLY-GLR2007-237FA-8-1) in CDCl.sub.3.

[0065] FIG. 4 is .sup.1H-NMR graph of 1′-methyl-1′,2′,3′,6′-tetrahydro-[3,4′-bipyridin]-6-amine (PH-GLY-GLR2007-237FA-8-2) in CDCl.sub.3.

[0066] FIG. 5 is .sup.1H-NMR graph of 2-amino-5-(1-methylpiperidin) pyridine (PH-GLY-GLR2007-237FA-8, compound 8) in CDCl.sub.3.

[0067] FIG. 6 is HPLC chromatogram for a crude product of compound 9, wherein PH-GLY-GLR20087-237FA-9 represents the crude product of compound 9.

[0068] FIG. 7 is HPLC chromatogram for compound 9 in Example 4, wherein PH-GLY-GLR2007-237FA-9 represents compound 9.

[0069] FIG. 8 is .sup.1H-NMR graph of compound 9 in CDCl.sub.3.

[0070] FIG. 9 is HPLC chromatogram for compound 9 in Example 5.

[0071] FIG. 10 is HPLC chromatogram for compound 9 in Example 6.

[0072] FIG. 11 is HPLC chromatogram for compound 10 in Example 7, wherein GLR2007-237FA represents compound 10.

[0073] FIG. 12 is .sup.1H-NMR graph of compound 10 in CD.sub.3OD.

[0074] FIG. 13 is HPLC chromatogram for compound 10 in Example 8.

[0075] FIG. 14 is HPLC chromatogram for compound 10 in Example 9.

DETAILED DESCRIPTION

[0076] The present invention is further illustrated by the following specific embodiments or examples. It should be noted that these embodiments or examples are not intended to limit the scope of the present invention.

[0077] In a specific embodiment of the present invention, illustratively shown are methods for preparing the compound of formula (I) (compound 3) of the first aspect of the present invention, the compound of formula (V) (compound 7) of the second aspect of the present invention, 5-fluoro-4-(7′-fluoro-2′-methylspiro[cyclopentane-1,3′-indol]-5′-yl)-N-(5-(1-methylpiperidin-4-yl)pyridin-2-yl)pyrimidin-2-amine (compound of formula (II) or compound 9) of the fourth aspect of the present invention, and the compound of formula (III) (compound 10) of the fifth aspect of the present invention, as shown in the process flowchart below.

##STR00026##

[0078] Regarding the method for preparing the compound of formula (I) (compound 3) of the first aspect of the present invention, the above process flow illustratively shows the synthesis route of the compound 3, that is, the compound 1 and the compound 2 are used as starting materials to generate hydrazone of the formula (IV) of the present invention first under basic conditions (in the presence of triethylamine), and then the hydrazone of formula (IV) is reacted in a solvent of 5% H.sub.2SO.sub.4 in methanol to give the compound 3.

[0079] Regarding the method for producing the compound of formula (V) (compound 7) of the second aspect of the present invention, the above process flow illustratively shows the synthesis route of the compound 7, that is, the compound 3 is used as a starting material and subjected to coupling reaction catalyzed by a palladium catalyst to give the compound 7.

[0080] Regarding the method for preparing 5-fluoro-4-(7′-fluoro-2′-methylspiro[cyclopentane-1,3′-indol]-5′-yl)-N-(5-(1-methylpiperidin-4-yl)pyridin-2-yl)pyrimidin-2-amine (compound of formula (II) or compound 9), the above process flow illustratively shows the synthesis route of the compound 9, that is, the compound 7 is used as a starting material and coupled with compound 8 in the presence of a catalyst to give the compound 9.

[0081] Regarding the method for preparing the compound of formula (III) (compound 10) of the sixth aspect of the present invention, the above process flow illustratively shows the synthesis route of the compound 10, that is, the compound 9 is used as a starting material and is reacted with fumaric acid to give the compound 10.

[0082] Abbreviations or Definitions:

[0083] C.sub.1-C.sub.5 linear or branched alkanol: a linear or branched alkanol having 1 to 5 carbon atoms.

[0084] Slurrying: stirring and washing the target product with a solvent with poor solubility to the product to remove impurities attached to the surface of the product, wherein the temperature can be raised for stirring and then be lowered for filtering.

[0085] “Pd(dppf)Cl.sub.2”: [1,1′-bis(diphenylphosphino)ferrocene]palladium dichloride

[0086] Pd(OAc).sub.2: palladium acetate

[0087] Pd(PPh.sub.3).sub.2Cl.sub.2: bis(triphenylphosphine)palladium (II) chloride

[0088] Pd.sub.2(dba).sub.3: tris(dibenzylideneacetone)dipalladium

Example 1: Synthesis of Compound 3

[0089] Methanol (5.0 vol.) and triethylamine (1.05 eq.) were added to a reaction kettle under nitrogen atmosphere, and (4-bromo-2-fluorophenyl)hydrazine hydrochloride (10 Kg, 1.0 eq.) was added with mechanical stirring. Then, cyclopentylethanone (4.628 Kg, 1.0 eq.) was added to the reaction kettle, and the reaction system was stirred at 30±10° C. until the reaction was completed. The reaction system was cooled, concentrated sulfuric acid (16.198 Kg, 3.2 eq.) was added dropwise slowly into the reaction system, and the temperature was maintained at ≤5° C. in the process of dropwise addition until it was completed. The reaction system was heated to 40-50° C. and stirred until the amount of the intermediate (hydrazone) was ≤1% as detected by HPLC. The reaction system was cooled to −10±2° C. n-heptane (50 L, 5 vol.) and purified water (100 L, 10 vol.) were added into the reaction system, and then ammonia water was slowly added while stirring to adjust the pH value to 8-9. The resulting reaction system was stirred for 10 min and then subjected to liquid separation. Water (50 L, 5 vol.) was added to the organic phase, and the mixture was stirred for 10 min and then left to stand for liquid separation, and the aqueous phase was discarded. The organic phase was washed once with 2 mol/L hydrochloric acid (1 vol.) and extracted with 2 mol/L hydrochloric acid (5 vol.×3). All aqueous phases with a 2 mol/L hydrochloric acid concentration were combined, and n-heptane (50 L, 5 vol.) was added. The reaction system was cooled to 0±5° C., and ammonia water was added to adjust the pH value to 8-9. The resulting reaction system was stirred for 20 min and then left to stand for liquid separation. The organic phase was concentrated under reduced pressure at 40° C., and a lot of solids were precipitated out. n-heptane (3 L, 0.3 vol.) was added, and the mixture was heated to 75-80° C. until the solution was clarified, and then stirred for 30 min. The solution was naturally cooled to room temperature to precipitate out crystals, and then the mixture was filtered and the filter cake was washed with n-heptane. The filter cake was dried under vacuum to give the compound 3 (4.2 Kg, 31% yield). A sample was taken for HPLC analysis. As shown in FIG. 1, the purity of the compound of formula I is 98.15%, and the maximum single impurity is 0.41%.

Example 2: Synthesis of Compound 7

[0090] Isopropanol (10.0 vol.), the compound 3 obtained in Example 1 (5.0 Kg, 1.0 eq.), potassium acetate (2.10 Kg, 1.20 eq.) and bis(pinacolato)diboron (4.98 Kg, 1.1 eq.) were added to a reaction kettle under nitrogen atmosphere. The reaction system was stirred, and [1,1′-bis(diphenylphosphino)ferrocene]palladium dichloride (0.195 Kg, 0.015 eq.) was added. The reaction system was heated to 85±5° C. and maintained at this temperature until the reaction was completed. The reaction system was concentrated under reduced pressure and then extracted with purified water and toluene. Liquid separation was then performed, and the aqueous phase was discarded. The resulting organic phase was filtered and concentrated under reduced pressure to give compound 5.

[0091] The compound 5 and toluene (8.0 vol.) were transferred into a reaction kettle and stirred. 2,4-dichloro-5-fluoropyrimidine (2.95 Kg, 1.0 eq.) and potassium phosphate (7.50 Kg, 2.0 eq.) were added, and the reaction system was stirred. [1,1′-bis(diphenylphosphino)ferrocene]palladium dichloride (0.195 Kg, 0.015 eq.) and purified water (1.0 vol.) were added to the reaction kettle successively. The resulting reaction system was heated to 85±5° C. and maintained at this temperature until the reaction was completed. The reaction system was cooled to 20-30° C. and centrifuged. The filter cake was washed twice with toluene and then discarded. The filtrate was washed with purified water and subjected to liquid separation, and the aqueous phase was discarded. The organic phase was transferred to a reaction kettle, and then activated carbon (10% w/w, 0.50 Kg) was added. The reaction system was stirred for about 2 h, cooled to 20-30° C. and subjected to suction filtration through celite (0.15 wt, 0.75 Kg) on a Buchner funnel. The filter cake was washed with toluene and the filtrate was collected, and the obtained organic phase was concentrated under reduced pressure. Methanol (5.0 vol.) was added, and the mixture was concentrated under reduced pressure to 2.0-3.0 volumes and then subjected to suction filtration. The filter cake was washed with methanol and then collected. A sample of the filter cake was taken for HPLC analysis. As shown in FIG. 2, the purity of the compound 7 is 97.83%, the content of the compound 5 is 0.11%, and the maximum single impurity is 0.95%. The production of the compound 7 was 4.175 Kg and its yield was 70.3%.

Example 3: Synthesis of 2-amino-5-(1-methylpiperidin)pyridine (Compound 8)

[0092] In a specific embodiment of the present invention, a method for preparing 2-amino-5-(1-methylpiperidin)pyridine (compound 8) of the third aspect of the present invention is illustratively shown, as shown in the process flowchart below.

##STR00027##

[0093] 3.1. Synthesis of 2-Boc-amino-5-(4-hydroxy-1-methylpiperidin)pyridine (also known as PH-GLY-GLR2007-237FA-8-1)

[0094] THF (20 vol.) and 2-Boc-amino-5-bromopyridine (1.0 eq.) were sequentially added to a four-neck reaction flask, and then the reaction system was cooled to −5-0° C., and isopropylmagnesium chloride (1.0 eq.) was added dropwise slowly. After the dropwise addition was completed, the resulting reaction system was stirred for 10 min at −5-0° C. The reaction system was then cooled to −20 to −10° C., and n-butyllithium (2.0 eq.) was added dropwise slowly. After the dropwise addition was completed, the reaction system was stirred for 30 min at −20 to −10° C. The temperature was maintained at −20 to −10° C., and a solution of N-methyl-4-piperidone in tetrahydrofuran (2.2 eq., 5 vol.) was added dropwise slowly. After the dropwise addition was completed, the reaction system was stirred for about 30 min at −20 to −10° C. A sample was taken, water was added to quench the reaction, and the reaction was substantially completed as monitored by LC. The reaction system was heated to −5-0° C., and water (10 vol.) was added dropwise slowly to the reaction flask. Liquid separation was performed, and the organic phase was collected and concentrated under reduced pressure. The resulting solid was slurried for 3 h at 20-30° C. with n-heptane and methyl tert-butyl ether (1:1, 10 vol.). Suction filtration was performed, and the filter cake was rinsed with n-heptane (2 vol.) and then collected. The filter cake was dried in a vacuum drying oven (50° C., −0.1 MPa) for 16 h to give a white solid (57% yield).

[0095] .sup.1H-NMR (300 MHz, CDCl.sub.3) δ8.41 (s, 1H), 7.92-7.78 (m, 3H), 2.78 (s, 1H), 2.44 (m, 2H), 2.37 (s, 3H), 2.14 (m, 2H), 1.81 (m, 4H), 1.55 (s, 9H), as shown in FIG. 3; MS (ESI) m/z=308.2[M+H].sup.+. 3.2. Synthesis of 1′-methyl-1′,2′,3′,6′-tetrahydro-[3,4′-bipyridin]-6-amine (also known as PH-GLY-GLR2007-237FA-8-2)

[0096] Toluene (10 vol.), 2-Boc-amino-5-(4-hydroxy-1-methylpiperidin)pyridine (1.0 eq.) and p-toluenesulfonic acid monohydrate (4.0 eq.) were sequentially added to a four-neck reaction flask, and the reaction system was heated to 100-110° C. and maintained at this temperature for 20 h. A sample was taken, and the reaction was substantially completed as monitored by LC. Water was added slowly to the reaction flask, and then the reaction system was cooled to 20-30° C. Liquid separation was performed, and the aqueous phase was collected. The pH of the aqueous phase was adjusted to 9-11 with 50% NaOH aqueous solution. Solids were precipitated out, and the mixture was stirred at 20-30° C. for 1 h. Suction filtration was performed, and the filter cake was collected. The filter cake was dried in a vacuum drying oven (50° C., −0.1 MPa) for 16 h to give a white solid (72.4% yield).

[0097] .sup.1H-NMR (300 MHz, CDCl.sub.3) δ8.11 (d, 1H), 7.54 (dd, 1H), 6.48 (d, 1H), 5.95 (m, 1H), 4.45 (s, 2H), 3.11 (m, 2H), 2.66 (m, 2H), 2.56 (m, 2H), 2.43 (s, 3H), as shown in FIG. 4; MS (ESI) m/z=190.1[M+H].sup.+.

[0098] 3.3. Synthesis of 2-amino-5-(1-methylpiperidin)pyridine (also known as PH-GLY-GLR2007-237FA-8 or compound 8)

[0099] Isopropanol (10 vol.), PH-GLY-GLR2007-237FA-8-2 (1.0 eq.) and wet Pd/C (10 wt %) were added sequentially to an autoclave. The reaction system was heated to 70-80° C. and maintained at this temperature for about 18 h under hydrogen atmosphere (1 MPa). A sample was taken, and the reaction was substantially completed as monitored by LC. The reaction system was subjected to suction filtration through celite. The filter cake was rinsed with isopropanol (2 vol.), and the filtrate was collected. The filtrate was concentrated to 1-2 volumes, subjected to replacement with ethyl acetate (2 vol.) three times, and concentrated to 1-2 volumes. n-heptane (10 vol.) was added, and the mixture was stirred at 20-30° C. for 3 h. Suction filtration was performed, and the filter cake was collected. The filter cake was dried in a vacuum drying oven (50° C., −0.1 MPa) for 16 h to give a white solid (94% yield).

[0100] .sup.1H-NMR (300 MHz, CDCl.sub.3) δ7.93 (d, 1H), 7.30 (dd, 1H), 6.47 (d, 1H), 4.35 (s, 2H), 2.93 (m, 2H), 2.41 (m, 1H), 2.38 (s, 3H), 2.06 (m, 2H), 1.76 (m, 4H), as shown in FIG. 5; MS (ESI) m/z=192.2[M+H].sup.+.

Example 4: Synthesis of 5-fluoro-4-(7′-fluoro-2′-methylspiro[cyclopentane-1,3′-indol]-5′-yl)-N-(5-(1-methylpiperidin-4-yl)pyridin-2-yl)pyrimidin-2-amine (Compound of Formula (II) or Compound 9)

[0101] Toluene (10.0 vol.) was added to a reaction kettle under nitrogen atmosphere, and then compound 7 (2.67 Kg, 1.0 eq.), compound 8 (1.40 Kg.), potassium carbonate (2.21 Kg, 2.0 eq.), 4,5-bis(diphenylphosphino)-9,9-dimethylxanthene (111.1 g, 0.024 eq.), palladium acetate (35.9 g, 0.02 eq.) and purified water (110.6 g) were added sequentially with stirring. The reaction system was heated to 80±5° C. and maintained at this temperature until the content of the compound 7 in the reaction solution was ≤2.0% as detected by HPLC. The reaction system was cooled to 20-30° C., stirred and centrifuged. The filter cake was washed with toluene (2.0 vol.) and collected, and the filtrate was discarded. A proper amount of dichloromethane and methanol was added to a reaction kettle under nitrogen atmosphere, and the reaction system was stirred. The filter cake was added, and the resulting reaction system was heated to 40±5° C., stirred, cooled to 20-30° C. and then filtered through celite in a suction filtration tank. The filter cake was washed with a solution of 2% methanol in dichloromethane (V/V), and the filtrate was collected. The filtrate was added to the reaction kettle under nitrogen atmosphere and stirred. Toluene (10.0 vol.) was added, the external temperature was controlled to be not lower than 85° C., the dichloromethane was distilled out under normal pressure until the internal temperature rose to 75±5° C., and then the distillation was stopped. The reaction system was cooled to 20-30° C., stirred and centrifuged. The filter cake was collected, and the filtrate was discarded. The resulting filter cake was dried in a vacuum drying oven to give 2.99 kg of a crude product of the compound 9, and a sample was taken for HPLC analysis. As shown in FIG. 6, the purity is 98.6%.

[0102] Aqueous hydrochloric acid solution (2 M, 10.0 vol.) was added to the reaction kettle and stirred under nitrogen atmosphere, and then the crude product of the compound 9 (1.0 eq.), dichloromethane (10.0 vol.) and mercapto silica gel (model: PSB-20, wt %=20%) (526.0 g) were sequentially added. The reaction system was stirred at 30-40° C. and the reaction was stopped until the amount of palladium residue was ≤10 ppm as detected by sampling and detection. Suction filtration was performed; the filtrate was separated, and the aqueous phase was taken. Dichloromethane (15.0 vol.) and methanol (1.5 vol.) were added to the aqueous phase, and the pH value was adjusted to 9-11 with aqueous sodium hydroxide solution. Liquid separation was performed, and the organic phase was taken and concentrated under reduced pressure to ≤2.0 volumes. The reaction system was cooled to 20-30° C., stirred for at least 3 h, and then subjected to suction filtration, and the filter cake was collected. The filter cake was dried in an oven, the production was 2.070 Kg, and the yield was 52.4%. A sample was taken for HPLC detection. As shown in FIG. 7, the purity of the compound 9 is 98.97%, and the maximum single impurity is 0.24%.

[0103] .sup.1H-NMR (400 MHz, CDCl.sub.3) δ 9.38 (br s, 1H), 8.49 (d, 1H, J=3.2 Hz), 8.34-8.33 (m, 2H), 7.96 (s, 1H), 7.88 (d, 1H, J=11.2 Hz), 7.58 (dd, 1H, J=8.8Hz, 1.6 Hz), 3.01-2.98 (m, 2H), 2.52-2.44 (m, 1H), 2.38 (s, 3H), 2.34 (s, 3H), 2.25-2.04 (m, 8H), 1.87-1.76 (m, 6H).

Example 5: Synthesis of 5-fluoro-4-(7′-fluoro-2′-methylspiro[cyclopentane-1,3′-indol]-5′-yl)-N-(5-(1-methylpiperidin-4-yl)pyridin-2-yl)pyrimidin-2-amine (Compound of Formula (II) or Compound 9)

[0104] A crude product of the compound 9 was obtained as in Example 4, and then the crude product of the compound 9 was dissolved in hydrochloric acid (2 M, 10 vol.) under nitrogen atmosphere. Then dichloromethane (10 vol.) was added, and the reaction system was heated to 30-40° C., stirred for 1 h, and filtered through celite. The filter cake was washed twice with purified water (1 vol.), liquid separation was performed, and the aqueous phase was taken. Dichloromethane (10 vol.) was added to the aqueous phase, and the mixture was stirred for 1 h at 30-40° C. and filtered through celite. The filter cake was washed twice with purified water (1 vol.), liquid separation was performed, and the aqueous phase was taken. Dichloromethane (10 vol.) was added to the aqueous phase, and the mixture was stirred for 1 h at 30-40° C. and filtered through celite. The filter cake was washed twice with purified water (1 vol.), liquid separation was performed, and the aqueous phase was taken. Dichloromethane (15.0 vol.) and methanol (1.5 vol.) were added to the aqueous phase, and the pH value was adjusted to 9-11 with aqueous sodium hydroxide solution. Liquid separation was performed, and the organic phase was taken. Mercapto silica gel (model: PSB-20, wt %=20%) was added, and the mixture was stirred for 16 h at 40° C. and filtered through celite. The organic phase was concentrated under reduced pressure to ≤2.0 volumes. The reaction system was cooled to 20-30° C., stirred for at least 3 h, and then subjected to suction filtration, and the filter cake was collected. The filter cake was dried in an oven, the production was 2.21 Kg, and the yield was 55.9%. A sample was taken for HPLC detection. As shown in FIG. 9, the purity of the compound 9 is 98.65%, and the maximum single impurity is 0.23%. The .sup.1H-NMR data are shown in FIG. 8.

[0105] .sup.1H-NMR (300 MHz, CDCl.sub.3) δ 8.45 (d, 1H), 8.37-7.87 (m, 6H), 3.04 (m, 2H), 2.53 (m, 1H), 2.47 (s, 3H), 2.45 (s, 3H), 2.28-1.69 (m, 16H).

Example 6: Synthesis of 5-fluoro-4-(7′-fluoro-2′-methylspiro[cyclopentane-1,3′-indol]-5′-yl)-N-(5-(1-methylpiperidin-4-yl)pyridin-2-yl)pyrimidin-2-amine (Compound of Formula (II) or Compound 9)

[0106] A crude product of the compound 9 was obtained as in Example 4. Aqueous hydrochloric acid solution (2 M, 10.0 vol.) was added to the reaction kettle and stirred under nitrogen atmosphere, and then the crude product of compound 9 (1.0 eq.), dichloromethane (10.0 vol.) and mercapto silica gel (model: PSB-20, wt %=20%, 526.0 g) were sequentially added. The reaction system was stirred at 30-40° C. and the reaction was stopped until the amount of palladium residue was ≤10 ppm as detected by sampling and detection. Suction filtration was performed; the filtrate was separated, and the aqueous phase was taken. Dichloromethane (15.0 vol.) and methanol (1.5 vol.) were added to the aqueous phase, and the pH value was adjusted to 9-11 with aqueous sodium hydroxide solution. Liquid separation was performed, and the organic phase was taken and concentrated under reduced pressure to dryness. Toluene (5.0 vol.) was added and distilled to dryness. The mixture was stirred, and toluene (5.0 vol.) and anhydrous ethanol (5.0 vol.) were added. The mixture was heated to reflux until it was clarified, stirred for 15 min while maintaining the temperature, slowly cooled to room temperature, stirred for 5 h, and then subjected to suction filtration. The filter cake was collected and dried in an oven, and its yield was 79.6%. A sample was taken for HPLC analysis. As shown in FIG. 10, the purity of the compound 9 is 98.96%, and the maximum single impurity is 0.45%.

Example 7: Synthesis of Compound 10

[0107] Dichloromethane (22.0 vol.) and ethanol (22.0 vol.) were added to a reaction kettle at room temperature under nitrogen atmosphere, and then the compound 9 (1.0 eq.) was added under mechanical stirring. The reaction system was heated to 30-40° C. and stirred until the solid was almost dissolved to a level of solution clarification. The reaction system was cooled to 20-30° C., and a solution of the compound 9 in dichloromethane and ethanol was added to another reaction kettle through a microporous filter and stirred. The reaction system was heated, dichloromethane and ethanol were distilled out under normal pressure, and the reaction temperature was maintained at 80±5° C. A solution of fumaric acid (1.0 eq.) in ethanol (12 vol.) was added dropwise slowly to the reaction kettle through a microporous filter, and then the reaction system was stirred at 80±5° C. overnight. The reaction system was then cooled to 20-30° C., stirred for at least 1 h and centrifuged. The filter cake was collected, and the filtrate was discarded. The filter cake was dried in a vacuum drying oven. A sample was taken for HPLC analysis. As shown in FIG. 11, the purity of the compound 10 is 99.7%, and the maximum single impurity is 0.077%. The production was 1.605 Kg and the yield was 63.6%. The .sup.1H-NMR data are shown in FIG. 12, and MS (ESI) m/z=489.2[M+H].sup.+.

Example 8: Synthesis of Compound 10

[0108] Dichloromethane (10.0 vol.) and ethanol (10.0 vol.) were added to a reaction kettle at room temperature under nitrogen atmosphere, and then the compound 9 (1.0 eq.) was added under mechanical stirring. The reaction system was heated to 30-40° C. and stirred until the solid was almost dissolved to a level of solution clarification. The reaction system was cooled to 20-30° C., and a solution of the compound 9 in dichloromethane and ethanol was added to another reaction kettle through a microporous filter and stirred. The reaction system was heated, dichloromethane and ethanol were distilled out under normal pressure, and the reaction temperature was maintained at 80±5° C. A solution of fumaric acid (1.0 eq.) in ethanol (7 vol.) was added dropwise slowly to the reaction kettle through a microporous filter, and then the reaction system was stirred at 80±5° C. overnight. The reaction system was then cooled to 20-30° C., stirred for at least 1 h and centrifuged. The filter cake was collected, and the filtrate was discarded. The filter cake was dried in a vacuum drying oven. A sample was taken for HPLC analysis.

[0109] As shown in FIG. 13, the purity of the compound 10 is 98.81%, and the maximum single impurity is 0.39%. The yield was 90%. MS (ESI) m/z=489.2[M+H].sup.+.

Example 9: Synthesis of Compound 10

[0110] Toluene (10.0 vol.) and ethanol (10.0 vol.) were added to a reaction kettle at room temperature under nitrogen atmosphere, and then the compound 9 (1.0 eq.) was added under mechanical stirring. The reaction system was heated to reflux and stirred until the solid was almost dissolved to a level of solution clarification. The solution was maintained at over 75° C., added to another reaction kettle through a microporous filter and stirred. The reaction system was heated to 80±5° C., and a solution of fumaric acid (1.0 eq.) in ethanol (12 vol.) was added dropwise slowly to the reaction kettle, and then the reaction system was stirred at 80±5° C. for 3 h. The reaction system was then slowly cooled to 20-30° C., stirred for at least 1 h and centrifuged. The filter cake was collected, and the filtrate was discarded. The filter cake was dried in a vacuum drying oven. A sample was taken for HPLC analysis. As shown in FIG. 14, the purity of the compound 10 is 99.14%, the maximum single impurity is 0.48%. The yield was 96.2%. MS (ESI) m/z=489.2 [M+H].sup.+.

[0111] The present invention has been illustrated by the above examples, but it should be understood that the above examples are for illustrative and descriptive purposes only and are not intended to limit the present invention to the scope of the described examples. Furthermore, it will be understood by those skilled in the art that the present invention is not limited to the examples described above, and that many variations and modifications can be made in accordance with the teachings of the present invention, all of which fall within the scope of the present invention as claimed. The protection scope of the present invention is defined by the appended claims and equivalents thereof.