Patent ID: 6479660
Filing Date: 2002-11-12
Classification: A61P,C07D,Y02A

Abstract:
A process for the preparation of a compound of formula (I) in which:R1 is C1-6 alkyl; R2 and R3 are independently hydrogen, halogen, trifluoromethyl or C1-6 alkoxy; R4 is C1-6 alkyl; R5 is hydrogen or C1-6 alkyl; and R6 is nitro or amino which comprises reacting a compound of formula (II): â€ƒin which R1, R4 and R5 are as defined in formula (I) and X is a leaving group with a compound of formula (III): â€ƒin which R2 and R3 are as defined in formula (I) and optionally thereafter: converting the compound of formula (I) into another compound of formula (I).