Synthesis of Symmetrically and Unsymmetrically Substituted N,N′-Diaryl­imidazolin-2-ones by Copper-Catalyzed Arylamidation under Microwave-Assisted­ and Conventional Conditions

Abstract

A convenient synthesis of unsymmetrically substituted N,N′-diarylimidazolin-2-ones is reported. Starting from 2,2-dimethoxyethylamine, the first aryl group was introduced by reaction with arylisocyanate and subsequent cyclization to afford N-arylimidazolin-2-ones. The second arylation step was then accomplished by microwave-assisted copper-catalyzed arylamidation of the N-arylimidazolin-2-ones with a variety of aryliodides and arylbromides to give unsymmetrically substituted N,N′-diarylimidazolin-2-ones. Symmetrically substituted N,N′-diarylimidazolin-2-ones could also be prepared from imidazolin-2-one in a two-fold copper-catalyzed arylamidation, however, the nature of the substrate limits the use of this reaction.

amination - arylation - copper - homogeneous catalysis - heterocycles

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