Efficient Microwave Assisted Syntheses of Unsubstituted Cyclic Imides

Abstract

A number of cyclic imides were synthesized from cyclic anhydrides using ammonium chloride (NH 4 Cl), and 4-N,N-dimethylaminopyridine (DMAP) or with ammonium acetate (NH 4 OAc) under microwave irradiation in both a mono-mode and a conventional microwave.Several substituted succinic anhydrides used as reactants were synthesized efficiently by Diels-Alder reactions of maleic anhydride with 1,3-cyclohexadienes in 63-82% for the mono-mode and 72-92% in the conventional microwave ovens.Cyclic imides were synthesized with yields from 50 -98%.