PROCESS FOR PREPARING OLOPATADINE AND/OR A PHARMACEUTICALLY ACCEPTABLE SALT THEREOF

摘要

The present invention relates to a process for the preparation of olopatadine and, more particularly, to an improved method of synthesizing olopatadine which comprises reacting a dibenz[b,e]oxepin-1 1-one derivative of formula (III) and a suitable reagent under Witting condition.