Flavone based EGFR inhibitors and process for preparation thereof

1. A compound of formula (I)

wherein, R is selected from hydrogen, alkyl, nitro and halogens selected from the group consisting of chlorine, bromine, fluorine and iodine;

R 1 =hydrogen, alkyl, alkoxy, aryl, nitro, trifluoromethyl, thioalkyl, trifluoromethoxy, trialkylsilyl and halogens selected from the group consisting of chlorine, bromine, fluorine and iodine.

2. The compound as claimed in claim 1 , wherein said compounds are selected from

2-(4-amino-2-(phenylamino) thiazol-5-yl)-4H-chromen-4-one (S1-M1),

2-(2-(p-tolylamino)-4-aminothiazol-5-yl)-7-hydroxy-4H-chromen-4-one (S1-M2),

2-(2-(o-tolylamino)-4-aminothiazol-5-yl)-7-hydroxy-4H-chromen-4-one (S1-M3),

2-(2-(2,6-dimethylphenylamino)-4-aminothiazol-5-yl)-7-hydroxy-4H-chromen-4-one (S1-M4),

2-(2-(2,6-dichlorophenylamino)-4-aminothiazol-5-yl)-7-hydroxy-4H-chromen-4-one (S1-M5),

2-(2-(4-methoxyphenylamino)-4-aminothiazol-5-yl)-7-hydroxy-4H-chromen-4-one (S1-M6),

2-(2-(2-methoxyphenylamino)-4-aminothiazol-5-yl)-7-hydroxy-4H-chromen-4-one (S1-M7),

2-(4-amino-2-(phenylamino) thiazol-5-yl)-7-hydroxy-4H-chromen-4-one (S1-M8),

2-(2-(p-tolylamino)-4-aminothiazol-5-yl)-4H-chromen-4-one (S1-M9),

2-(2-(p-tolylamino)-4-aminothiazol-5-yl)-6-methoxy-4H-chromen-4-one (S1-M10),

2-(2-(o-tolylamino)-4-aminothiazol-5-yl)-6-methoxy-4H-chromen-4-one (S1-M11),

2-(2-(2,6-dimethylphenylamino)-4-aminothiazol-5-yl)-6-methoxy-4H-chromen-4-one (S1-M12),

2-(2-(2,6-dichlorophenylamino)-4-aminothiazol-5-yl)-6-methoxy-4H-chromen-4-one (S1-M13),

2-(2-(4-methoxyphenylamino)-4-aminothiazol-5-yl)-7-methoxy-4H-chromen-4-one (S1-M14),

2-(2-(2-methoxyphenylamino)-4-aminothiazol-5-yl)-7-methoxy-4H-chromen-4-one (S1-M15).

3. The process for the preparation of compounds of formula (I) as claimed in claim 1 , wherein said process comprising the steps of:

a) reacting a mixture of substituted phenyl amine in water with carbon disulfide in presence of potassium carbonate by reaction with cyanuric chloride to afford substituted N-Phenyl isothiocynate;

b) reacting N-Phenyl isothiocynate with guanidine in carbon tetrachloride by refluxing the mixture for the period in the range of 2-4 hrs to afford substituted 1-phenyl-3-formamidinothiocarbamide (intermediate 1);

c) refluxing the reaction mixture of substituted 2-hydroxy acetophenone and chloroacetyl chloride in dimethyl formamide in presence of sodium chloro acetate at a temperature in the range of 185 to 195° C. to for the period in the range of 5 to 6 hr to afford 2-Chloromethyl-4-H-Chromen-4-one derivatives (intermediate 2);

d) refluxing the solution containing compound of step (b) and compound of step (c) in methanol for a period in the range 4 to 6 hrs at a temperature in the range of 50 to 70° C. to afford compound of formula (I).

4. The process as claimed in claim 3 , wherein said substituted phenyl amine compound is selected from phenyl amine, 4-methoxy phenyl amine, 4-nitro phenyl amine, 2-nitro phenyl amine, 4-Chloro phenyl amine, 3-(trifluoromethyl) benzenamine, 3,5-bis (trifluoromethyl) benzenamine, 4-(trifluoromethoxy) benzenamine, 2,4,6-trimethylbenzenamine and 4-bromo-2-fluorobenzenamine.

5. The process as claimed in claim 3 , wherein said substituted N-Phenyl Isothiocynate compound is selected from phenyl isothiocynate, 4-methoxy phenyl isothiocynate, 4-nitro phenyl isothiocynate, 2-nitro phenyl isothiocynate, 4-Chloro phenyl isothiocynate, 2-isothiocyanato-1,3,5-trimethylbenzene and 4-bromo-2-fluoro-1-isothiocyanatobenzene.

6. The process as claimed in claim 3 , wherein said substituted 1-phenyl-3-formamidinothiocarbamide compound is selected from 1-phenyl-3-formamidinothiocarbamide, 4-Methoxy Phenyl-3-formamidinothiocarbamide, 4-Nitro Phenyl-3-formamidinothiocarbamide, 2-Nitro Phenyl-3-formamidinothiocarbamide, 4-Chloro Phenyl-3-formamidinothiocarbamide, 2,4,6-trimethyl Phenyl-3-formamidinothiocarbamide and 2-Fluro,4-Bromo phenyl-3 formamidinothiocarbamide.

7. The process as claimed in claim 3 , substituted 2-hydroxy acetophenone in step (c) is selected from 1-(2-hydroxyphenyl) ethanone, 1-(2-hydroxy-4-methylphenyl)ethanone, 1-(2,4-dihydroxyphenyl)ethanone, 1-(4-chloro-2-hydroxyphenyl)ethanone, 1-(4-fluoro-2-hydroxyphenyl)ethanone.

8. The process as claimed in claim 3 , wherein said compound named intermediate 2 in step (c) is selected from 2-Chloromethyl-4-H-Chromen-4-one, 2-(Chloromethyl)-7-Hydroxy-4-H-Chromen-4-one and 2-(Chloromethyl)-6-Methoxy-4-H-Chromen-4-one.

9. A pharmaceutical composition comprising compound of formula (I) as claimed in claim 1 and at least one pharmaceutically acceptable carrier.