PROTEIN KINASE INHIBITORS

Abstract

The present disclosure relates to compounds that act as protein kinase inhibitors, and the synthesis of the same. Further, the present disclosure teaches the utilization of such compounds in a treatment for proliferative diseases, including cancer, particularly breast cancer, and especially ER+ and/or HER2+ breast cancer.

Claims

1. A compound according to Formula (II), and/or a stereoisomer and/or pharmaceutically acceptable salt and/or solvate thereof: ##STR00005## wherein: W, X, Y and Z independently represent hydrogen, C(R.sup.5), O, S, CH.sub.2O, CH.sub.2S, (CH.sub.2).sub.2O, NR.sup.6, NR.sup.6CH.sub.2, CH.sub.2NR.sup.6, NR.sup.6CO, CONR.sup.6, NN, NHCONH, NHCSNH, COO, COOCH.sub.2, SO.sub.2NH, NHSO.sub.2, CR.sup.4CR.sup.4, CC, OCH.sub.2CO, OCH.sub.2CH.sub.2O, CH(OH), or NO.sub.2 bridging groups; R.sup.5 independently represent hydrogen, halogen, C.sub.1-6 alkyl, C.sub.1-6 alkenyl, C.sub.1-6 alkoxy, C.sub.1-6haloalkyl, haloC.sub.1-6alkoxy, COOH, CONH.sub.2, COC.sub.1-6 alkyl, OC.sub.1-6 alkyl, NH.sub.2, NHC.sub.1-6 alkyl, or SC.sub.1-6 alkyl groups; and R.sup.1, R.sup.2, R.sup.3, R.sup.4 and R.sup.6 independently represent hydrogen, halogen, aryl, C.sub.3-8 cycloalkyl, monocyclic or bicyclic heterocyclyl, monocyclic or bicyclic heteroaryl, wherein the aryl, heteroaryl or heterocyclyl groups may be optionally substituted by one or more R.sup.4 groups.

2. The compound according to claim 1, wherein W represents C(R.sup.5), R.sup.5 represents hydrogen, and R.sup.4 represents hydrogen.

3. The compound according to claim 1, wherein Z represents C(R.sup.5), R.sup.5 represents hydrogen, and R.sup.3 represents hydrogen.

4. The compound according to claim 1, wherein W and Y represent C(R.sup.5), R.sup.5 represents hydrogen, and R.sup.2 and R.sup.4 represent hydrogen.

5. The compound according to claim 1, wherein W and Z represent C(R.sup.5), R.sup.5 represents hydrogen, and R.sup.3 and R.sup.4 represent hydrogen.

6. The compound according to claim 1, wherein at least one of W, X, Y, or Z is methyl, and R.sup.1, R.sup.2, R.sup.3, and R.sup.4 are hydrogen.

7. The compound according to claim 1, wherein Y, X, and W are independently selected from H or C(R.sup.5); Z is hydrogen; R.sup.1, R.sup.2, R.sup.3, and R.sup.4 are independently selected from hydrogen or halogen, and R.sup.5 is hydrogen.

8. The compound according to claim 1, wherein Y X, and W are independently selected from hydrogen or methyl; Z is hydrogen; and R.sup.1, R.sup.2, R.sup.3, and R.sup.4 are independently selected from hydrogen or halogen.

9. The compound according to claim 1, wherein said compound is 5,8-dihydroxy-2-methylnaphthalene-1,4-dione.

10. The compound according to claim 1, wherein said compound is 5, 8-dihydroxy-6-methylnaphthalene-1,4-dione.

11. The compound according to claim 1, wherein said compound is 5,8-dihydroxy-2,7-dimethylnaphthalene-1,4-dione.

12. The compound according to claim 1, wherein said compound is 5,8-dihydroxy-2,6-dimethylnaphthalene-1,4-dione.

13. The compound according to claim 1, wherein said compound is 2-(bromomethyl)-5,8-dihydroxynaphthalene-1,4-dione.

14. The compound of claim 1 for use in the treatment of a proliferative disease in a mammal in need thereof.

15. The compound of claim 1 for use in the treatment of a cancer in a mammal in need thereof.

16. The compound of claim 1 for use in inhibiting a tyrosine kinase to treat a tyrosine kinase-dependent disease in a mammal in need thereof.

17. A composition comprising the compound of claim 1 for use as a medicament.

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

19. The pharmaceutical composition of claim 18, suitable for enteral administration.

20. The pharmaceutical composition of claim 18, wherein said pharmaceutical composition is suitable for oral administration.

21. The pharmaceutical composition of claim 18, suitable for parenteral administration.

22. A method of treating a tyrosine kinase dependent disease comprising administering to a subject a compound, pharmaceutically acceptable salt, or solvate of claim 1 or a pharmaceutical composition thereof.

23. A method of treating breast cancer comprising administering to a subject in need of such treatment a compound, pharmaceutically acceptable salt, or solvate of claim 1 or a pharmaceutical composition thereof.

24. The method of claim 23, wherein said breast cancer is an ER-positive breast cancer.

25. The method of claim 23, where said subject expresses a mutant ER- protein.

26. The method of claim 23, wherein said breast cancer is an HER2-positive breast cancer.

27. The method of claim 23, wherein said subject expresses a HER216.

28. The method of claim 23, wherein said subject expresses a truncated HER2 (p95HER2).

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0049] For a further understanding of the nature, objects, and advantages of the present disclosure, reference should be had to the following detailed description, read in conjunction with the following drawings, wherein like reference numerals denote like elements.

[0050] FIG. 1 shows a scheme for synthesis of 5,8-dihydroxynapthalene-1,4-dione derivatives using Friedel Crafts acylation.

[0051] FIG. 2 shows another scheme for synthesis of 5,8-dihydroxynaphthalene-1,4-dione derivatives and 5-methylnaphthalene-1,4-dione.

[0052] FIG. 3 shows another scheme for synthesis of 5-hydroxy-8-methylnaphthalene-1,4-dione and 5-methylnaphthalene-1,4-dione.

[0053] FIG. 4 shows another scheme for synthesis of 5-hydroxy-7-methylnaphthalene-1,4-dione, 5-methoxy-methylnaphthalene-1,4-dione, and 5-hydroxy-7-bromomethylnaphthalene-1,4-dione.

[0054] FIG. 5 shows charts of cell viability after 48 hr treatment of each compound at a concentration of 10 M.

[0055] FIG. 6 shows dose response curves for inhibition of MCF-7/pcDNA, MCF-7/HER2 and MCF-7/HER216 cells by compounds 7 (A), 9 (B), and (8a+8b) (C).

[0056] FIG. 7 shows western blot analysis of autophosphorylation at the HER2 residue Y1248. Compounds 6, 7, (8a+8b) and 9 inhibit the phosphorylation at HER2-Y1248 in MCF7/pcDNA, MCF/HER2 and MCF7/HER216. Compounds 15, 25, 26 and 27, did not show notable inhibition of phosphorylation at HER2-Y1248 even though they showed notable inhibition in the high-throughput assay. Compound 28 (2-methyl-4,6-dinitro-1H-indene-1,3(2H)-dione), which did not show notable inhibition in the high-throughput assay shows significant phosphorylation at HER2-Y1248 in all of the three cell lines.

[0057] FIG. 8 shows Western blot analysis of autophosphorylation at the EGFR residue Y1068. Compounds 6, 7, (8a+8b) and 9 inhibit the phosphorylation at EGFR-Y1068 in MCF7/pcDNA, MCF/HER2 and MCF7/HER216. Compound 26 did not show notable inhibition of phosphorylation at HER2-Y1248 even though it showed notable inhibition in the high-throughput assay. Compound 28 (2-methyl-4,6-dinitro-1H-indene-1,3(2H)-dione), which did not show notable inhibition in the high-through put assay shows significant phosphorylation at HER2-Y1248 and EGFR-Y1068 in all of the three cell lines.

[0058] FIG. 9 shows inhibition of various breast cancer cell lines by compound 7.

[0059] FIG. 10 shows high throughput assay of Compound 7 against a panel of 100 disease relevant kinases at a concentration of 10 M performed by Thermo Fisher Scientific's SelectScreen Profiling Service.

[0060] FIG. 11(A) shows ATP-binding pocket of HER2 kinase domain created using X-ray structures. The molecular surface depiction of the binding pocket is based on lipophilic and lipophilic characteristics. The dimensions of the two linked cavities in the ATP-binding pocket is shown. FIG. 11(B) shows the structure of planar compound 7 and its dimensions. FIG. 11(C) shows binding mode of compound 7 in the inner second cavity of the ATP-binding pocket of HER2 kinase domain. FIG. 11(D) shows the hydrogen bonding interaction of compound 7 with the ATP-binding pocket residues Thr862, Leu796 and Leu852.

DETAILED DESCRIPTION

[0061] Before the subject disclosure is further described, it is to be understood that the disclosure is not limited to the particular embodiments of the disclosure described below, as variations of the particular embodiments may be made and still fall within the scope of the appended claims. It is also to be understood that the terminology employed is for the purpose of describing particular embodiments, and is not intended to be limiting. Instead, the scope of the present disclosure will be established by the appended claims.

[0062] In this specification and the appended claims, the singular forms a, an, and the include plural reference unless the context clearly dictates otherwise. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood to one of ordinary skill in the art to which this disclosure belongs.

[0063] As used herein, the term minimize or reduce, or derivatives thereof, include a complete or partial inhibition of a specified biological effect (which is apparent from the context in which the terms minimize or reduce are used).

[0064] The compounds according to the disclosure are isolated and purified in a manner known per se, e.g. by distilling off the solvent in vacuo and recrystallizing the residue obtained from a suitable solvent or subjecting it to one of the customary purification methods, such as chromatography on a suitable support material. Furthermore, reverse phase preparative HPLC of compounds of the present disclosure which possess a sufficiently basic or acidic functionality, may result in the formation of a salt, such as, in the case of a compound of the present disclosure which is sufficiently basic, a trifluoroacetate or formate salt for example, or, in the case of a compound of the present disclosure which is sufficiently acidic, an ammonium salt for example. Salts of this type can either be transformed into its free base or free acid form, respectively, by various methods known to the person skilled in the art, or be used as salts in subsequent biological assays. Additionally, the drying process during the isolation of compounds of the present disclosure may not fully remove traces of cosolvents, especially such as formic acid or trifluoroacetic acid, to give solvates or inclusion complexes. The person skilled in the art will recognize which solvates or inclusion complexes are acceptable to be used in subsequent biological assays. It is to be understood that the specific form (e.g., salt, free base, solvate, inclusion complex) of a compound of the present disclosure as isolated as described herein is not necessarily the only form in which said compound can be applied to a biological assay in order to quantify the specific biological activity.

[0065] One aspect of the disclosure is salts of the compounds according to the disclosure including all inorganic and organic salts, especially all pharmaceutically acceptable inorganic and organic salts, particularly all pharmaceutically acceptable inorganic and organic salts customarily used in pharmacy.

[0066] Examples of salts include, but are not limited to, lithium, sodium, potassium, calcium, aluminum, magnesium, titanium, meglumine, ammonium, salts optionally derived from NH.sub.3 or organic amines having from 1 to 16 C-atoms such as, e.g., ethylamine, diethylamine, triethylamine, ethyldiisopropylamine, monoethanolamine, diethanolamine, triethanolamine, dicyclohexylamine, dimethylaminoethanol, procaine, dibenzylamine, N-methylmorpholine, arginine, lysine, ethylenediamine, N-methylpiperindine and guanidinium salts.

[0067] The salts include water-insoluble and, particularly, water-soluble salts.

[0068] As used herein, pharmaceutically acceptable salts refer to derivatives of the compounds disclosed herein wherein the parent compound is modified by making acid or base salts thereof. Examples of pharmaceutically acceptable salts include, but are not limited to, mineral or organic acid salts of basic residues such as amines, alkali or organic salts of acidic residues such as carboxylic acids, and the like. The pharmaceutically acceptable salts include the conventional non-toxic salts or the quaternary ammonium salts of the parent compound formed, for example, from non-toxic inorganic or organic acids. For example, such conventional non-toxic salts include, but are not limited to, those derived from inorganic and organic acids selected from 2-acetoxybenzoic, 2-hydroxyethane sulfonic, acetic, ascorbic, benzene sulfonic, benzoic, bicarbonic, carbonic, citric, edetic, ethane disulfonic, 1,2-ethane sulfonic, fumaric, glucoheptonic, gluconic, glutamic, glycolic, glycollyarsanilic, hexylresorcinic, hydrabamic, hydrobromic, hydrochloric, hydroiodic, hydroxymaleic, hydroxynaphthoic, isethionic, lactic, lactobionic, lauryl sulfonic, maleic, malic, mandelic, methane sulfonic, napsylic, nitric, oxalic, pamoic, pantothenic, phenylacetic, phosphoric, polygalacturonic, propionic, salicyclic, stearic, subacetic, succinic, sulfamic, sulfanilic, sulfuric, tannic, tartaric, toluene sulfonic, and the commonly occurring amine acids, e.g., glycine, alanine, phenylalanine, arginine, etc.

[0069] Other examples of pharmaceutically acceptable salts include hexanoic acid, cyclopentane propionic acid, pyruvic acid, malonic acid, 3-(4-hydroxybenzoyl)benzoic acid, cinnamic acid, 4-chlorobenzenesulfonic acid, 2-naphthalenesulfonic acid, 4-toluenesulfonic acid, camphorsulfonic acid, 4-methylbicyclo-[2.2.2]-oct-2-ene-1-carboxylic acid, 3-phenylpropionic acid, trimethylacetic acid, tertiary butylacetic acid, muconic acid, and the like. The present disclosure also encompasses salts formed when an acidic proton present in the parent compound either is replaced by a metal ion, e.g., an alkali metal ion, an alkaline earth ion, or an aluminum ion; or coordinates with an organic base such as ethanolamine, diethanolamine, triethanolamine, tromethamine, N-methylglucamine, and the like. In the salt form, it is understood that the ratio of the compound to the cation or anion of the salt may be 1:1, or any ratio other than 1:1, e.g., 3:1, 2:1, 1:2, or 1:3.

[0070] It should be understood that all references to pharmaceutically acceptable salts include solvent addition forms (solvates) or crystal forms (polymorphs) as defined herein, of the same salt.

[0071] Salts of the compounds of formulas (I), (II), (III), (IV), (V), or (VI) according to the disclosure can be obtained by dissolving the free compound in a suitable solvent (for example a ketone such as acetone, methylethylketone or methylisobutylketone, an ether such as diethyl ether, tetrahydrofuran or dioxane, a chlorinated hydrocarbon such as methylene chloride or chloroform, or a low molecular weight aliphatic alcohol such as methanol, ethanol or isopropanol) which contains the desired acid or base, or to which the desired acid or base is then added. The acid or base can be employed in salt preparation, depending on whether a mono- or polybasic acid or base is concerned and depending on which salt is desired, in an equimolar quantitative ratio or one differing therefrom. The salts are obtained by filtering, reprecipitating, precipitating with a non-solvent for the salt or by evaporating the solvent. Salts obtained can be converted into the free compounds which, in turn, can be converted into salts. In this manner, pharmaceutically unacceptable salts, which can be obtained, for example, as process products in the manufacturing on an industrial scale, can be converted into pharmaceutically acceptable salts by processes known to the person skilled in the art.

[0072] According to the person skilled in the art the compounds of formulas (I) through (VI) according to this disclosure as well as their salts may contain, e.g., when isolated in crystalline form, varying amounts of solvents. Included within the scope of the disclosure are therefore all solvates and in particular all hydrates of the compounds of formulas (I) through (VI) according to this disclosure as well as all solvates and in particular all hydrates of the salts of the compounds of formulas (I) through (VI) according to this disclosure.

[0073] Solvate means solvent addition forms that contain either stoichiometric or non stoichiometric amounts of solvent. Some compounds have a tendency to trap a fixed molar ratio of solvent molecules in the crystalline solid state, thus forming a solvate. If the solvent is water the solvate formed is a hydrate; and if the solvent is alcohol, the solvate formed is an alcoholate. Hydrates are formed by the combination of one or more molecules of water with one molecule of the substance in which the water retains its molecular state as H.sub.2O.

[0074] The compounds according to the disclosure and their salts can exist in the form of tautomers which are included in the embodiments of the disclosure.

[0075] Tautomer is one of two or more structural isomers that exist in equilibrium and is readily converted from one isomeric form to another. This conversion results in the formal migration of a hydrogen atom accompanied by a switch of adjacent conjugated double bonds. Tautomers exist as a mixture of a tautomeric set in solution. In solutions where tautomerization is possible, a chemical equilibrium of the tautomers will be reached. The exact ratio of the tautomers depends on several factors, including temperature, solvent and pH. The concept of tautomers that are interconvertible by tautomerizations is called tautomerism.

[0076] Where the present specification depicts a compound prone to tautomerization, but only depicts one of the tautomers, it is understood that all tautomers are included as part of the meaning of the chemical depicted. It is to be understood that the compounds disclosed herein may be depicted as different tautomers. It should also be understood that when compounds have tautomeric forms, all tautomeric forms are intended to be included, and the naming of the compounds does not exclude any tautomer form.

[0077] Of the various types of tautomerism that are possible, two are commonly observed. In keto-enol tautomerism a simultaneous shift of electrons and a hydrogen atom occurs. Ring-chain tautomerism arises as a result of the aldehyde group (CHO) in a sugar chain molecule reacting with one of the hydroxy groups (OH) in the same molecule to give it a cyclic (ring-shaped) form as exhibited by glucose.

[0078] Common tautomeric pairs are: ketone-enol, amide-nitrile, lactam-lactim, amide-imidic acid tautomerism in heterocyclic rings (e.g., in nucleobases such as guanine, thymine and cytosine), imine-enamine and enamine-enamine.

[0079] The compounds of the disclosure may, depending on their structure, exist in different stereoisomeric forms. These forms include configurational isomers or optically conformational isomers (enantiomers and/or diastereoisomers including those of atropisomers). The present disclosure therefore includes enantiomers, diastereoisomers as well as mixtures thereof. From those mixtures of enantiomers and/or diastereoisomers pure stereoisomeric forms can be isolated with methods known in the art, preferably methods of chromatography, especially high performance liquid chromatography (HPLC) using achiral or chiral phase. The disclosure further includes all mixtures of the stereoisomers mentioned above independent of the ratio, including the racemates.

[0080] The compounds of the disclosure may, depending on their structure, exist in various stable isotopic forms. These forms include those in which one or more hydrogen atoms have been replaced with deuterium atoms, those in which one or more nitrogen atoms have been replaced with .sup.15N atoms, or those in which one or more atoms of carbon, fluorine, chlorine, bromine, sulfur, or oxygen have been replaced by the stable isotope of the respective, original atoms.

[0081] Some of the compounds and salts according to the disclosure may exist in different crystalline forms (polymorphs) which are within the scope of the disclosure.

[0082] It is a further object of the disclosure to provide tyrosine kinase inhibitor compounds disclosed herein, methods of synthesizing the tyrosine kinase inhibitor compounds, methods of manufacturing the tyrosine kinase inhibitor compounds, and methods of using the tyrosine kinase inhibitor compounds. The compounds can also be made by synthetic schemes well established in the art.

[0083] Another object of the disclosure is to provide a composition, for example a pharmaceutical composition, comprising at least one tyrosine kinase inhibitor compound disclosed herein in an amount effective for the indication of proliferative diseases such as cancer, including but not limited to endocrine related cancer. In an embodiment, the cancer is an ER-positive tumor and/or a HER2-positive tumor, such as a tumor of the breast, endometrium, uterus, or ovary. In an embodiment, the tumor is an ER-positive and/or HER2-positive tumor of the breast. In an embodiment, the breast tumor is determined to be ER-positive by an immunohistochemical method described by Hammond et al.

[0084] In an embodiment, the object of such treatment is to inhibit tyrosine kinases.

[0085] As used herein, treating means administering to a subject a pharmaceutical composition to ameliorate, reduce or lessen the symptoms of a disease. As used herein, treating or treat describes the management and care of a subject for the purpose of combating a disease, condition, or disorder and includes the administration of a compound disclosed herein, or a pharmaceutically acceptable salt, polymorph or solvate thereof, to alleviate the symptoms or complications of a disease, condition or disorder, or to eliminate the disease, condition or disorder. The term treat may also include treatment of a cell in vitro or an animal model. As used herein, subject or subjects refers to any animal, such as mammals including rodents (e.g., mice or rats), dogs, primates, lemurs or humans.

[0086] Treating cancer may result in a reduction in size of a tumor. A reduction in size of a tumor may also be referred to as tumor regression. Preferably, after treatment, tumor size is reduced by 5% or greater relative to its size prior to treatment; more preferably, tumor size is reduced by 10% or greater; more preferably, reduced by 20% or greater; more preferably, reduced by 30% or greater; more preferably, reduced by 40% or greater; even more preferably, reduced by 50% or greater; and most preferably, reduced by greater than 75% or greater. Size of a tumor may be measured by any reproducible means of measurement. The size of a tumor may be measured as a diameter of the tumor.

[0087] Treating cancer may result in a reduction in tumor volume. Preferably, after treatment, tumor volume is reduced by 5% or greater relative to its size prior to treatment; more preferably, tumor volume is reduced by 10% or greater; more preferably, reduced by 20% or greater; more preferably, reduced by 30% or greater; more preferably, reduced by 40% or greater; even more preferably, reduced by 50% or greater; and most preferably, reduced by greater than 75% or greater. Tumor volume may be measured by any reproducible means of measurement.

[0088] Treating cancer may result in a decrease in number of tumors. Preferably, after treatment, tumor number is reduced by 5% or greater relative to number prior to treatment; more preferably, tumor number is reduced by 10% or greater; more preferably, reduced by 20% or greater; more preferably, reduced by 30% or greater; more preferably, reduced by 40% or greater; even more preferably, reduced by 50% or greater; and most preferably, reduced by greater than 75%. Number of tumors may be measured by any reproducible means of measurement. The number of tumors may be measured by counting tumors visible to the naked eye or at a specified magnification. Preferably, the specified magnification is 2, 3, 4, 5, 10, or 50.

[0089] Treating cancer may result in a decrease in number of metastatic lesions in other tissues or organs distant from the primary tumor site. Preferably, after treatment, the number of metastatic lesions is reduced by 5% or greater relative to number prior to treatment; more preferably, the number of metastatic lesions is reduced by 10% or greater; more preferably, reduced by 20% or greater; more preferably, reduced by 30% or greater; more preferably, reduced by 40% or greater; even more preferably, reduced by 50% or greater; and most preferably, reduced by greater than 75%. The number of metastatic lesions may be measured by any reproducible means of measurement. The number of metastatic lesions may be measured by counting metastatic lesions visible to the naked eye or at a specified magnification. Preferably, the specified magnification is 2, 3, 4, 5, 10, or 50.

[0090] Treating cancer may result in an increase in average survival time of a population of treated subjects in comparison to a population receiving carrier alone. Preferably, the average survival time is increased by more than 30 days; more preferably, by more than 60 days; more preferably, by more than 90 days; and most preferably, by more than 120 days. An increase in average survival time of a population may be measured by any reproducible means. An increase in average survival time of a population may be measured, for example, by calculating for a population the average length of survival following initiation of treatment with an active compound. An increase in average survival time of a population may also be measured, for example, by calculating for a population the average length of survival following completion of a first round of treatment with an active compound.

[0091] Treating cancer may result in an increase in average survival time of a population of treated subjects in comparison to a population of untreated subjects. Preferably, the average survival time is increased by more than 30 days; more preferably, by more than 60 days; more preferably, by more than 90 days; and most preferably, by more than 120 days. An increase in average survival time of a population may be measured by any reproducible means. An increase in average survival time of a population may be measured, for example, by calculating for a population the average length of survival following initiation of treatment with an active compound. An increase in average survival time of a population may also be measured, for example, by calculating for a population the average length of survival following completion of a first round of treatment with an active compound.

[0092] Treating cancer may result in increase in average survival time of a population of treated subjects in comparison to a population receiving monotherapy with a drug that is not a compound disclosed herein, or a pharmaceutically acceptable salt thereof. Preferably, the average survival time is increased by more than 30 days; more preferably, by more than 60 days; more preferably, by more than 90 days; and most preferably, by more than 120 days. An increase in average survival time of a population may be measured by any reproducible means. An increase in average survival time of a population may be measured, for example, by calculating for a population the average length of survival following initiation of treatment with an active compound. An increase in average survival time of a population may also be measured, for example, by calculating for a population the average length of survival following completion of a first round of treatment with an active compound.

[0093] Treating cancer may result in a decrease in the mortality rate of a population of treated subjects in comparison to a population receiving carrier alone. Treating cancer may result in a decrease in the mortality rate of a population of treated subjects in comparison to an untreated population. Treating cancer may result in a decrease in the mortality rate of a population of treated subjects in comparison to a population receiving monotherapy with a drug that is not a compound disclosed herein, or a pharmaceutically acceptable salt, prodrug, metabolite, analog or derivative thereof. Preferably, the mortality rate is decreased by more than 2%; more preferably, by more than 5%; more preferably, by more than 10%; and most preferably, by more than 25%. A decrease in the mortality rate of a population of treated subjects may be measured by any reproducible means. A decrease in the mortality rate of a population may be measured, for example, by calculating for a population the average number of disease-related deaths per unit time following initiation of treatment with an active compound. A decrease in the mortality rate of a population may also be measured, for example, by calculating for a population the average number of disease-related deaths per unit time following completion of a first round of treatment with an active compound.

[0094] Treating cancer may result in a decrease in tumor growth rate. Preferably, after treatment, tumor growth rate is reduced by at least 5% relative to number prior to treatment; more preferably, tumor growth rate is reduced by at least 10%; more preferably, reduced by at least 20%; more preferably, reduced by at least 30%; more preferably, reduced by at least 40%; more preferably, reduced by at least 50%; even more preferably, reduced by at least 50%; and most preferably, reduced by at least 75%. Tumor growth rate may be measured by any reproducible means of measurement. Tumor growth rate may be measured according to a change in tumor diameter per unit time.

[0095] Treating cancer may result in a decrease in tumor regrowth, for example, following attempts to remove it surgically. Preferably, after treatment, tumor regrowth is less than 5%; more preferably, tumor regrowth is less than 10%; more preferably, less than 20%; more preferably, less than 30%; more preferably, less than 40%; more preferably, less than 50%; even more preferably, less than 50%; and most preferably, less than 75%. Tumor regrowth may be measured by any reproducible means of measurement. Tumor regrowth is measured, for example, by measuring an increase in the diameter of a tumor after a prior tumor shrinkage that followed treatment. A decrease in tumor regrowth is indicated by failure of tumors to reoccur after treatment has stopped.

[0096] Treating or preventing a cell proliferative disorder may result in a reduction in the rate of cellular proliferation. Preferably, after treatment, the rate of cellular proliferation is reduced by at least 5%; more preferably, by at least 10%; more preferably, by at least 20%; more preferably, by at least 30%; more preferably, by at least 40%; more preferably, by at least 50%; even more preferably, by at least 50%; and most preferably, by at least 75%. The rate of cellular proliferation may be measured by any reproducible means of measurement. The rate of cellular proliferation is measured, for example, by measuring the number of dividing cells in a tissue sample per unit time.

[0097] Treating or preventing a cell proliferative disorder may result in a reduction in the proportion of proliferating cells. Preferably, after treatment, the proportion of proliferating cells is reduced by at least 5%; more preferably, by at least 10%; more preferably, by at least 20%; more preferably, by at least 30%; more preferably, by at least 40%; more preferably, by at least 50%; even more preferably, by at least 50%; and most preferably, by at least 75%. The proportion of proliferating cells may be measured by any reproducible means of measurement. Preferably, the proportion of proliferating cells is measured, for example, by quantifying the number of dividing cells relative to the number of nondividing cells in a tissue sample. The proportion of proliferating cells may be equivalent to the mitotic index.

[0098] Treating or preventing a cell proliferative disorder may result in a decrease in size of an area or zone of cellular proliferation. Preferably, after treatment, size of an area or zone of cellular proliferation is reduced by at least 5% relative to its size prior to treatment; more preferably, reduced by at least 10%; more preferably, reduced by at least 20%; more preferably, reduced by at least 30%; more preferably, reduced by at least 40%; more preferably, reduced by at least 50%; even more preferably, reduced by at least 50%; and most preferably, reduced by at least 75%. Size of an area or zone of cellular proliferation may be measured by any reproducible means of measurement. The size of an area or zone of cellular proliferation may be measured as a diameter or width of an area or zone of cellular proliferation.

[0099] Treating or preventing a cell proliferative disorder may result in a decrease in the number or proportion of cells having an abnormal appearance or morphology. Preferably, after treatment, the number of cells having an abnormal morphology is reduced by at least 5% relative to its size prior to treatment; more preferably, reduced by at least 10%; more preferably, reduced by at least 20%; more preferably, reduced by at least 30%; more preferably, reduced by at least 40%; more preferably, reduced by at least 50%; even more preferably, reduced by at least 50%; and most preferably, reduced by at least 75%. An abnormal cellular appearance or morphology may be measured by any reproducible means of measurement. An abnormal cellular morphology may be measured by microscopy, e.g., using an inverted tissue culture microscope. An abnormal cellular morphology may take the form of nuclear pleiomorphism.

EXAMPLES

[0100] Hereby are provided non-limiting examples of embodiments of compounds disclosed herein.

Example

[0101] 5,8-dihydroxynaphthoquinone derivatives substituted at the 2, 3, 6 and 7 positions were synthesized. Four different schemes were employed for this purpose.

[0102] Scheme 1 (FIG. 1) involved the double Friedel-Crafts acylation reaction using substituted maleic anhydrides and/or substituted 1,4-dimethoxybenzene in the presence of aluminum chloride and sodium chloride at high temperatures followed by demethylation with HCl at 0 C. (25-55% yield). With a methyl substitution on both of the reactants 8a and 8b isomeric mixture of products were obtained as inseparable mixture. With the use of visible light initiation (120 W flood lamps), free radical halogenation of compound 6 using N-bromosuccinimide gave the brominated side chain compound 9 in 32% yield.

[0103] The second synthetic route (FIG. 2) made use of the established reaction sequence for generating 1,4,5,8-tetramethoxy-2-naphthaldehyde from 1,5-dihydroxynaphthalene 12. Compounds 14, 15, 16 and 17 were prepared using reported methods. The preparation of ethyl (E)-3-(5,8-dihydroxy-1,4-dioxo-1,4-dihydronaphthalen-2-yl)acrylate 20 was achieved through a three step process involving the Wittig reaction of 2-formyl-1,4,5,8-tetramethoxynaphthalene 12 and ethyl (triphenylphosphoranylidene)acetate in DCM at room temperature. The phosphonium ylide was prepared through nucleophilic substitution of ethyl 2-bromoacetate with triphenylphosphine under refluxing conditions in toluene. The precipitated phophonium bromide salt was filtered, then deprotonated with sodium hydroxide to afford ethyl (triphenylphosphoranylidene)acetate. The obtained Wittig product ethyl (E)-3-(1,4,5,8-tetramethoxynaphthalen-2-yl)acrylate 18 was then oxidized using aqueous ammonium cerium (IV) nitrate at room temperature which afforded a mixture of isomers that were easily separated through silica gel chromatography and showed distinct chemical shifts in proton NMR. Demethylation of ethyl (E)-3-(5,8-dimethoxy-1,4-dioxo-1,4-dihydronaphthalen-2-yl)acrylate was achieved through a boron tribromide adduct which was hydrolyzed by addition of water to afford the product 20 (41% yield from 12). The photooxidation method was used to prepare 5-hydroxynaphthalene-1,4-dione (juglone) 11 from 1,5-dihydroxynaphthalene by bubbling molecular oxygen in methanol in the presence rose-bengal catalyst and green LED.

[0104] Compounds 5-hydroxy-8-methylnaphthalene-1,4-dione 22 and 5-methylnaphthalene-1,4-dione 23 were prepared through a Diels-Alder [4+2] cycloaddition of 2-methylthiophene and 1,4-benzoquinone, with m-chloroperoxybenzoic acid in chloroform for 48 h followed by purification using silica gel chromatography in FIG. 3.

[0105] Compound 5-hydroxy-7-methylnaphthalene-1,4-dione 25 was prepared through a Diels-Alder [4+2] cycloaddition using 3-methyl-1-methoxy-1-trimethylsiloxy-1,4-diene and 1,4-benzoquinone as a dienophile at 0 C. for 20 h in FIG. 4. The resulting 7-methyl 5-(trimethylsiloxy)naphthalene-1,4-dione adduct was hydrolyzed using 1N HCl in methanol to afforded the product 25. Compound 5-methoxy-7-methylnaphthalene-1,4-dione 27 was obtained by refluxing 25 in silver (II) oxide with iodomethane followed by filtration over celite and flash chromatography. Side chain bromination of compound 25 to form compound 26 was accomplished using N-bromosuccinimide in the presence of the radical initiator AIBN in carbon tetrachloride under refluxing conditions.

[0106] The antagonistic activities of the compounds were tested in an estrogen receptor positive (ER+) breast cancer cell line, MCF7 breast cancer cell lines expressing HER2, HER216 and empty vector. Lapatinib was used as the positive control. The cells were treated with the compounds at 10 M concentration for 48 h. After treatment, cell viability was tested using the CellTiter-Glo Assay (Promega). Out of a total of 24 compounds mentioned above tested, 5 compounds suppressed cell viability potently in all three cell lines. After 48 h, these 5 compounds decreased cell viability by >90% when compared to lapatinib with a cell viability of <70% at the same concentration. 8 compounds showed moderate suppression of cell viability with many of them showing a greater inhibition of the MCF7-HER2 cell line than the MCF7-HER216 cell line in a pattern that was similar to that lapatinib (FIG. 5). The six best compounds 7, 9, the mixture of 8a+8b, 25 and 27 were then taken up for further studies.

[0107] The IC.sub.50 values, defined as the concentration of the compound required to inhibit cell proliferation by 50%, of the six best compounds from the high-throughput screening were measured by treating each of the cell lines with different drug concentrations for 48 h followed by the CellTiter-Glo Assay to detect cell viability (Table 1).

TABLE-US-00001 TABLE 1 Inhibition of MCF-7/pcDNA, MCF-7/HER2 and MCF-7/HER216 breast cancer cell lines by the six compounds identified from the high-throughput assay. IC.sub.50 in M Compound MCF-7/pcDNA MCF-7/HER2 MCF-7/HER2D16 7 0.32 0.29 0.51 8a + 8b 1.28 1.30 0.51 9 1.66 1.78 3.61 22 2.93 4.61 9.39 25 30.88 ND ND 27 4.94 3.18 7.30

[0108] Lapatinib, a known HER2/EGFR inhibitor in clinical use was taken as the positive standard. Lapatinib inhibited the three cell lines MCF-7/pcDNA, MCF-7/HER2 and MCF-7/HER216 with an IC.sub.50 value of 15.71 M, 15.79 M and 19.22 M. Other than compound 25, most of our compounds (7, 9, the mixture of 8a+8b, and 27) showed higher potency of inhibition of the three breast cancer cell lines than lapatinib. The dose-response curves for the three compounds 7, the mixture of 8a+8b and 9 with the lowest IC.sub.50 values for MCF-7/pcDNA (0.32 M, 1.28 M and 1.66 M), MCF-7/HER2 (0.29 M, 1.30 M and 1.78 M) and MCF-7/HER2D16 (0.51 M, 0.51 M and 3.61 M) are represented in FIG. 6. Compound 7 showed the lowest inhibition potency for all three cell lines.

[0109] HER2 is a member of the erbB family of tyrosine kinases, which is comprised of four partial homologous transmembrane receptors: EGFR/HER1 (erbB1), HER2 (erbB2/neu), HER3 (erbB3), and HER4 (erbB4). With the exception of HER2, these other receptors exhibit ligand specificity. Ligand binding induces homo- or hetero-dimerization through disulfide bond linkage, and leads to receptor activation and tyrosine auto-phosphorylation. HER2 is a preferred dimerization partner due to its high catalytic activity and forms potent heterodimers with EGFR and HER3. HER2, with its intrinsic kinase activity can transphosphorylate other members of the erbB family. HER2 and HER16 are overexpressed in the breast cancer cell lines that have been used in this study, leading to the kinases being constitutively active. Upon dimerization, the constitutively active HER2 and HER216 receptors can transphosphorylate coexpressed EGFR. The levels of phosphorylated HER2 in the parental MCF-7 cell line were less, resulting in its lack of dimerization with EGFR and its transphosphorylation. Western blots were performed to determine the ability of the compounds to inhibit the activation of the HER2 receptor (FIG. 7). The total and phosphorylated protein were detected upon treatment of each of the cells lines with the compounds 6, 7, 8a+8b, 9, 15, 25, 26, 27 and 28 (2-methyl-4,6-dinitro-1H-indene-1,3(2H)-dione) along with the positive control lapatinib at 10 M concentration for 2 h. Compound 28 (2-methyl-4,6-dinitro-1H-indene-1,3(2H)-dione) did not show notable growth inhibition in the high-throughput assay and was used as a negative control. Compounds 6, 7, 8a+8b, and 9 significantly decreased HER2 activating phosphorylation to the same extent as lapatinib at the auto-phosphorylation site Y1284. Compounds 15, 25, 26, and 27 did not show such an effect on auto-phosphorylation. The ability of these compounds to inhibit the breast cancer cell lines and not the HER2 auto-phosphorylation at Y1284 indicates that the mechanism of growth inhibition in cancer cells might involve some other alternate pathway. The compounds 6, 7, 8a+8b, and 9 that showed decreased autophosphorylation in HER2 were then tested for the ability to decrease transphosphorylation of the EGFR receptor at the residue Y1068 (FIG. 8). Compounds 26 and 28 from FIG. 5 were used as negative controls. The transphosphorylation at Y1068 of EGFR receptor was decreased by the compounds 6, 7, 8a+8b, and 9 in levels comparable to that of lapatinib.

Compound 7 Example

[0110] Compound 7 was taken up for further analysis of its ability to inhibit the growth of a panel of breast cancer cell lines of varied types. The panel included the triple negative cell lines BT20, MDA-MB-468 and MDA-MB-231, the trastuzumab sensitive cell lines SKBR3 and BT474, and the trastuzumab resistant cell lines SUM 190PT and SUM 225CWN (FIG. 9). Compound 7 inhibited the growth of these breast cancer cell lines with IC.sub.50 values ranging from 0.1231 M to 2.923 M. The potency of inhibition was comparable for most of the cell lines that were tested except for MDA-MB-231 where a 3-4 fold decrease in potency was evidenced.

[0111] Compound 7 was then subjected to a cross kinase panel high-throughput assay at 10 M concentration, at Life Technologies, to determine the selectivity of kinase inhibition (FIG. 10). A panel of 120 disease relevant kinases (available with Life Technologies) were studied. 11 kinases were inhibited at 80% or more-protein kinase B 1/2 (also known as AKT1/2), Aurora kinases A/B (AurK A/B), checkpoint kinase 2 (CHEK2), feline sarcoma kinase (FES), fibroblast growth factor 1 (FGFR1), I kappa B kinase B/E (IKK B/E), mitogen activated protein kinase kinase 1 (MAP2K1), mitogen activated protein kinase kinase kinase 8 (MAP3K8), Never in Mitosis (NIMA) related kinase 2 (NEK2), polo-like kinase 1/3 (PLK1/3), serum/glucocorticoid regulated kinase 1 (SGK1) and TEK tyrosine kinase. All these kinases except for CHEK2 are reported to have tumorigenic roles in breast cancer [13-20].

[0112] Docking studies were performed on the active compounds with the HER2 X-ray crystal structure using the Molecular Operating Environment (MOE) software's docking module. The binding pocket of the HER2 protein is L-shaped with two large cavities that are connected to each other (FIG. 11(A)). The cavity where the base of the ATP molecule binds to the hinge region has a width of 13.11 and height of 8.30 . The second cavity behind the first cavity has the invariant Lys753 and Asp853 residues outlining it with a width of 22.13 and height of 9.20 . Compound 7 is a planar molecule with the dimensions 8.07 X 6.63 (FIG. 11(B)). Docking studies of this compound revealed that it preferred to reside in the second cavity where it made more hydrogen bonds with the sidechain hydroxyl group of Thr862, backbone NH of Asp863 and the backbone carbonyl of Leu796 (FIG. 11(C) and FIG. 11(D)). The sidechain methyl group of compound 7 depicted hydrophobic interactions with the sidechain of Leu852 and the sidechain methyl group of Thr862. On the other hand, compound 3 with the structure

##STR00004##

with one less phenolic group on the other hand preferred to reside in the first cavity. The additional hydrogen bonds made by the compound 7 might have contributed to its greater efficacy in growth inhibition of the breast cancer cell lines MCF-7/HER2 and MCF-7/HER216.

[0113] With several of the highly selective kinase inhibitors in clinical settings as breast cancer therapeutics leading to the development of resistance within a year, the thought arises whether inhibition of more than one key tumorigenic kinase would be the path to take for achieving success in the fight against aggressive and refractory breast cancer. Such an approach will also require better success at targeted delivery of these agents to minimize any side effects due to multiple kinase targeting. The compounds of the present invention may solve these needs.

[0114] All references cited in this specification are herein incorporated by reference as though each reference was specifically and individually indicated to be incorporated by reference. The citation of any reference is for its disclosure prior to the filing date and should not be construed as an admission that the present disclosure is not entitled to antedate such reference by virtue of prior invention.

[0115] It will be understood that each of the elements described above, or two or more together may also find a useful application in other types of methods differing from the type described above. Without further analysis, the foregoing will so fully reveal the gist of the present disclosure that others can, by applying current knowledge, readily adapt it for various applications without omitting features that, from the standpoint of prior art, fairly constitute essential characteristics of the generic or specific aspects of this disclosure set forth in the appended claims. The foregoing embodiments are presented by way of example only; the scope of the present disclosure is to be limited only by the following claims.

REFERENCES CITED

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