Microwave-Assisted Synthesis of Benzo-fused Seven-membered Azaheterocycles

Abstract

The use of microwave energy in chemical reactions has revolutionized the field of heterocyclic chemistry in the past two decades. Synergy of microwave methodology with reactions performed on support media and/or in the absence of solvent constitutes an environmentally clean technique, which offers tremendous advantages such as clean chemistry, reduction in reaction times, improved yields, and applicability to wide range of reactions, safety and tremendous scope for automation over the traditional heating. The benzoannulated azaheterocycles display an impressive repertoire of biological activities. The present review will provide an in-depth view of microwave-assisted preparation of benzo-fused seven- membered azaheterocycles such as benzodiazepines, benzothiazepines and benzoxazepines.