Synthesis of 4-Aryl-1,3,4-benzotriazepinones from Isatoic Anhydrides and Hydrazonyl Chlorides.

An efficient synthesis of 4-aryl-1,3,4-benzotriazepinones from readily available isatoic anhydrides and hydrazonyl chlorides was developed. In this facile protocol, a series of functionalized 1,3,4-benzotriazepinones were conveniently obtained with broad substrate scope and excellent functional group tolerance.