Preparation of paroxetine involving novel intermediates

摘要

Disclosed are processes for preparing novel carbamate intermediates of paroxetine comprising dealkylating N-alkylparoxetine by reaction thereof with a haloalkyl ester of a haloformic acid, in a suitable organic solvent. Also disclosed are processes for preparing paroxetine comprising hydrolyzing the novel carbamate intermediates in a suitable solvent. Paroxetine prepared by the above processes can be neutralized with hydrogen chloride and crystallized as paroxetine hydrochloride anhydrous, hemihydrate or as a solvate of isopropanol. The invention is further directed to the novel carbamate intermediates formed by the disclosed processes.