PROCESS FOR THE PREPARATION OF RACEMIC AND OPTICALLY ACTIVE 4-CHLORO-3-[5-CHLORO-1-(2,4-DIMETHOXYBENZYL)-3-ALKYL-2-OXO-2,3-DIHYDRO-1H-INDOL-3-YL]BENZOIC ACID DERIVATIVES USING A PHASE TRANSFER CATALYST

摘要

The invention relates to a process for the preparation of racemic and optically active 4-chloro-3-[5-chloro-1-(2,4-dimethoxybenzyl)-3-alkyl-2-oxo-2,3-dihydro-lH-indol-3-yl]benzoic acid derivatives of the general formula (I), wherein R represents a hydrogen atom or a straight or branched alkyl group containing 1-4 carbon atoms and R<SUP>1</SUP> represents a straight or branched alkyl group containing 1-4 carbon atoms.