Patent ID: 7488824

Claim:
A process for the preparation of a compound of formula I wherein R is methyl or ethyl; R 05 is Hydrogen; R 1 is —CH 2 —, —CH 2 CH 2 —, —CH 2 CH 2 CH 2 —, —CF 2 —, —CH═CHCH 2 —, —CH(CH 3 )— or —C≡CCH 2 —; R 4 is trifluoromethyl, chlorodifluoromethyl or difluoromethyl; X 1 is oxygen; R 2 is CH 3 , CH 2 CH 3 , CH 2 OCH 3 , CH 2 OCH 2 CH 3 , CH 2 CH 2 OCH 3 , CH 2 CH 2 OCH 2 CH 3 , CH 2 CF 3 , propargyl, cyclopropylmethyl, benzyl, CH 2 CH 2 SO 2 CH 3 or CH 2 CH 2 OCH 2 CH 2 OCH 3 ; which process comprises reacting a compound of formula II wherein R 3 is C 1 -C 8 alkyl or C 3 -C 6 cycloalkyl and R 4 and R 05 are as defined for formula I, with a compound of formula III wherein R, R 1 , R 2 and X 1 are as defined for formula I, in an inert solvent in the presence of a proton source.