Synthesis of Symmetrically and Unsymmetrically Substituted <i>N</i>,<i>N</i>′-Diarylimidazolin-2-ones by Copper-Catalyzed Arylamidation under Microwave-Assisted and Conventional Conditions
作者:Doris Kunz、Thomas Hafner
DOI:10.1055/s-2007-966021
日期:2007.5
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.
报告了一种方便合成不对称取代的N,N′-二芳基咪唑啉-2-酮的方法。以2,2-二甲氧基乙胺为起始物,通过与芳基异氰酸酯反应并随后的环化,引入第一个芳基团,得到N-芳基咪唑啉-2-酮。第二步芳基化反应则通过微波辅助下的铜催化芳酰胺化,与各种芳基碘化物和芳基溴化物反应,从而生成不对称取代的N,N′-二芳基咪唑啉-2-酮。对称取代的N,N′-二芳基咪唑啉-2-酮也可以通过在两步铜催化芳酰胺化反应中从咪唑啉-2-酮合成,然而,底物的性质限制了该反应的应用。