A facial synthesis of quinazolino[1,4]benzodiazepine alkaloids via reductive N-heterocyclization of N-(2-nitrobenzoyl)amides: total synthesis of asperlicin C, circumdatin H, and its analogues

Abstract

A facile and short synthesis of a series of quinazolino [1,4]benzodiazepine alkaloids, including asperlicin C, circumdatin H and some analogues, is reported utilizing coupling of readily available [1,4]benzodiazepine with 2-nitrobenzoyl chlorides, followed by a reductive Nheterocyclization.