Direct access to the optically active VAChT inhibitor vesamicol and its analogues via the asymmetric aminolysis of meso-epoxides with secondary aliphatic amines

Abstract

First highly enantioselective synthesis of biologically important vesamicol, benzovesamicol, and their derivatives was achieved via the desymmetrization of meso-epoxides with secondary aliphatic amines (4-phenylpiperidine derivatives) using a chiral [salenCo(iii)-BF₄] catalyst at room temperature. All products were obtained in good yield and with excellent optical induction.