Patent ID: 8163936

Claim:
A process for preparation of a compound of general formula (I) wherein R 1 , R 3 and R 4 are independently hydrogen, halo, —O(C 1 -C 6 alkyl), —CON(R 11 ) 2 , —SOR 11 , —SO 2 R 11 , —SO 2 N(R 11 ) 2 , —N(R 11 ) 2 , —NR 11 COR 11 , —CO 2 R 11 , —COR 11 , —SR 11 , —OH, —NO 2 or —CN; each R 11 is independently hydrogen or C 1 -C 6 alkyl; R 2 is halogen; R 5 and R 6 are each independently hydrogen, or C 1 -C 6 alkyl or together with the carbon atom to which they are attached form a C 3 -C 7 cycloalkyl group; R 7 is methyl; R 8 is phenyl, naphthalenvl, quinolinyl, quinoxalinyl, thiazolyl, or biphenyl, any of which is optionally substituted with one or more substituents selected from halo, C 1 -C 6 alkyl, —O(C 1 -C 6 )alkyl, —CON(R 11 ) 2 , —SOR 11 , —SO 2 R 11 , —SO 2 N(R 11 ) 2 , —N(R 11 ) 2 , —NR 11 COR 11 , —CO 2 R 11 , —COR 11 , —SR 11 , —OH, —NO 2 or —CN; wherein R 11 is as defined above; R 9 is hydrogen, or C 1 -C 6 alkyl; provided that: R 8 is not unsubstituted phenyl or phenyl substituted with —COOH; said process comprising the hydrolysis of a compound of general formula (II) wherein R 1 , R 2 , R 3 , R 4 , R 5 , R 6 , R 7 , R 8 , and R 9 are as defined above and wherein R 12 is C 1 -C 6 alkyl.