Process for the preparation of N-(4-(6,7-dimethoxyquinolin-4-yloxy)phenyl)-N′-(4-fluorophenyl)cyclopropane-1, 1-dicarboxamide, (2S)-hydroxybutanedioate and its polymorphs thereof

1. A crystalline form-S of N-(4-(6,7-dimethoxyquinolin-4-yloxy)phenyl)-N′-(4-fluorophenyl)cyclopropane-1,1-dicarboxamide (S)-malate compound of formula-1a,

characterized by its powder x-ray diffraction pattern having peaks at 10.0±0.2 and further comprising peaks at 8.2 and 13.3±0.2 degrees two theta.

2. A crystalline form-S of N-(4-(6,7-dimethoxyquinolin-4-yloxy)phenyl)-N′-(4-fluorophenyl)cyclopropane-1,1-dicarboxamide (S)-malate compound of formula-1a according to claim 1 characterized by its powder x-ray diffraction having peaks at 10.0±0.2 and further comprising peaks at 15.1 and 18.2±0.2 degrees two theta.

3. A crystalline form-S of N-(4-(6,7-dimethoxyquinolin-4-yloxy)phenyl)-N′-(4-fluorophenyl)cyclopropane-1,1-dicarboxamide (S)-malate compound of formula-1a according to claim 1 further characterized by its powder x-ray diffraction pattern having peaks at 6.6, 7.6, 10.5, 12.5, 16.4, 19.0, 20.2, 20.6, 21.6, 22.6, 25.1, 26.1, 27.0, 28.1, 29.8 and 32.8±0.2 degrees two theta.

4. A crystalline form-S of N-(4-(6,7-dimethoxyquinolin-4-yloxy)phenyl)-N′-(4-fluorophenyl)cyclopropane-1,1-dicarboxamide (S)-malate compound of formula-1a according to claim 1 further characterized by its powder x-ray diffraction pattern as depicted in figure-6.

5. A process for the preparation of crystalline form-S of compound of formula-1a according to claim 1 , comprising

a) stirring a mixture of compound of formula-1a in a solvent or a mixture of solvents,

b) filtering the solid and drying to the solid to obtain crystalline form-S of compound of formula-1a.

6. A process for the preparation of crystalline form-S of compound of formula-1a according to claim 5 , comprising:

a) adding a solvent to a compound of formula-1a,

b) heating the mixture to a suitable temperature,

c) adding the obtained solution to an anti-solvent,

d) filtering the precipitated solid and drying to obtain crystalline form-S of compound of formula-1a,

wherein the solvent used in step-a) is selected from alcohol solvents, ester solvents, nitrile solvents, polar aprotic solvents, hydrocarbon solvents, ether solvents, ketone solvents, polar solvents such as water or mixture thereof;

the suitable temperature in step-b) is ranging from ambient temperature to the reflux temperature of the solvent used in the reaction;

the anti-solvent used in step-c) is chloro solvents.

7. The process according to claim 6 , comprising:

a) adding a mixture of tetrahydrofuran and water to a compound of formula-1a,

b) heating the mixture,

c) adding the obtained solution to dichloromethane, and

d) filtering the precipitated solid and drying to obtain crystalline form-S of compound of formula-1a.

8. A process for the preparation of crystalline form-S of compound of formula-1a according to claim 1 , comprising:

a) treating compound of formula-1b with a base in a solvent,

b) adding a solvent to the mixture,

c) adding malic acid to the solution,

d) adding an anti-solvent to the mixture, and

e) filtering the precipitated solid and dried to provide crystalline form-S of compound of formula-1a,

wherein, the base used in step-a) is selected from organic base or inorganic base;

the solvent used in step-b) is selected from alcohol solvents, ester solvents, ketone solvents, ether solvents, hydrocarbon solvents, polar aprotic solvents, nitrile solvents, polar solvents like water or mixture thereof;

the anti-solvent used in step-d) is chloro solvents.

9. The process according to claim 8 , comprising:

a) treating compound of formula-1b with aqueous sodium carbonate and water,

b) adding a mixture of ethyl acetate and tetrahydrofuran to the mixture,

c) adding malic acid to the solution,

d) adding dichloromethane to the mixture, and

e) filtering the precipitated solid and dried to provide crystalline form-S of compound of formula-1a.

10. A process for the preparation of crystalline form-S of compound of formula-1a according to claim 1 , comprising:

a) treating compound of formula-1b with aqueous sodium carbonate and water,

b) adding a mixture of ethyl acetate and tetrahydrofuran to the mixture

c) adding dichloromethane to the mixture,

d) adding malic acid to the solution, and

e) filtering the precipitated solid and dried to provide crystalline form-S of compound of formula-1a.

11. A process for the preparation of crystalline form-S of compound of formula-1a according to claim 1 , comprising:

a) treating compound of formula-1b with aqueous sodium carbonate and water,

b) adding a mixture of ethyl acetate, tetrahydrofuran and malic acid to the solution,

c) adding dichloromethane to the mixture, and

d) filtering the precipitated solid and dried to provide crystalline form-S of compound of formula-1a.

12. A process for the preparation of crystalline form-S of compound of formula-1a according to claim 1 , comprising:

a) treating compound of formula-1b with a base in a solvent,

b) adding a solvent to the mixture,

c) adding malic acid to the solution,

d) adding the mixture to a solvent, and

e) filtering the precipitated solid and dried to provide crystalline form-S of compound of formula-1a.

13. The process according to claim 12 , wherein the base used in step-a) is selected from organic base or inorganic base; the solvent used in step-b) is selected from the group consisting of alcohol solvents, ester solvents, ketone solvents, ether solvents, hydrocarbon solvents, polar aprotic solvents, nitrile solvents, polar solvents like water and a mixture thereof; and the solvent used in step-d) is chloro solvents.

14. A process for the preparation of crystalline form-S of compound of formula-1a according to claim 1 , comprising:

a) treating compound of formula-1b with aqueous sodium carbonate in water,

b) adding a mixture of ethyl acetate and tetrahydrofuran to the mixture,

c) adding malic acid to the solution,

d) adding the mixture to dichloromethane, and

e) filtering the precipitated solid and dried to provide crystalline form-S of compound of formula-1a.

15. A pharmaceutical composition comprising crystalline form-S of compound of formula-1a and a pharmaceutical acceptable carrier or diluent according to claim 1 .