Synthesis and Spectroscopic Evidences of N-Arylmaleimides and N-Aryl-2,3-dimethylmaleimides

摘要

A series of N-arylmaleimides (N-aryl-MI) and N-aryl-2,3-dimethylmaleimides (N-aryl-DiMeMI) were prepared by condensation of primary amines with maleic anhydride (MAn) and 2,3-di-methylmaleic anhydride (DiMeMAn), respectively. Preparation of N-aryl-MI proceeded through the formation of N-arylmaleamic acid, which subsequently cyclized to N-aryl-MI. In the reaction of N-arylamines with DiMeMAn, cyclic condensation products were formed in one step. By means of one- and two-dimensional ~1H and ~(13)C NMR spectroscopy it was proven that N-aryl-DiMeMI and not isomaleimides were formed by a one step reaction.