PROCESS FOR PREPARATION OF DIBENZOTHIAZEPINONE COMPOUNDS

摘要

The present invention discloses a process for the preparation of dibenzothiazepinone compounds of Formula I. The process for preparation of a dibenzothiazepinone compound of Formula I comprises reaction of compound of formula II in the presence of an acid catalyst comprising phosphorus pentoxide and methanesulfonic acid. The dibenzothiazepinone compounds of Formula I are key intermediate for the preparation of 2-(2-(4-dibenzo[b,f][1,4]thiazepine-11-yl-1-piperazinyl)ethoxy)ethanol known as quetiapine and its derivatives, which are effective antipsychotic substances.