Studies on Benzodiazepinooxazoles. V. Reactions of Benzo [6, 7]-1, 4-diazepino [5, 4-b] oxazole Derivatives with Acetic Anhydride

Abstract

Treatment of benzo [6, 7]-1, 4-diazepino [5, 4-b] oxazole derivatives (IIIa and IIId) with acetic anhydride and pyridine gave isoindole compounds (IV, V, VI, IX, X and XI) with ring contraction. A plausible mechanism of the reaction and the physical properties of these products are presented.