Patent ID: 8093421

Claim:
Process for the production of a compound of the formula (II) wherein ** marks an asymmetric carbon atom, R 1 is optionally substituted C 1 -C 4 alkyl and R 2 is methyl which is optionally substituted by one or more substituents selected from the group consisting of halogen, cyano, nitro, C 1 -C 4 -alkoxy, C 1 -C 4 -alkylthio, C 1 -C 4 -alkylsulphinyl, C 1 -C 4 -alkylsulphonyl, (C 1 -C 4 -alkoxy)carbonyl, C 1 -C 4 -alkylamino, di-(C 1 -C 4 -alkyl)amino, C 3 -C 6 -cycloalkylamino and (C 1 -C 4 -alkyl) C 3 -C 6 -cycloalkylamino, characterized in that tetrafluoroethyldimethylamine is reacted with a lactic acid derivative of the formula (I) wherein * marks an asymmetric carbon atom in R- or S-configuration and R 1 and R 2 have the meaning given above, the carbon atom marked ** in formula (II) having inversed configuration in comparison the corresponding carbon atom marked * in formula (I).