PROCESS FOR PRODUCING 1-BENZYL-4-[(5,6-DIMETHOXY-1-INDANONE)-2-YLIDENE]METHYLPIPERIDINE

摘要

It is intended to provide a process for producing 1-benzyl-4-[(5,6-dimethoxy-1-indanon)-2-ylidene]methylpiperidine represented by the structural formula (I): (I) which is useful as an intermediate material for a pharmaceutical or a solvate thereof in which impurity content is further reduced and operation is simple and suitable for industrial production by reacting 5,6-dimethoxy-1-indanone with 1-benzyl-4-formylpiperidine in a reaction solvent in the presence of a base and then gradually crystallizing a target substance in a reaction mixture in a high temperature region.