<i>N,N′</i>-Cyclization of carbodiimides with 2-(bromomethyl)acrylic acid. A direct entry to the system 5-methylene-6<i>H</i>-pyrimidine-2,4-dione, a new class of thymine analogues
作者:J. M. Anglada、T. Campos、F. Camps、J. M. Moretó、L.L. Pagès
DOI:10.1002/jhet.5570330444
日期:1996.7
Carbodiimides react under very mild conditions with 2-(bromomethyl)acrylic acid at both N atoms to give 1,3-disubstituted-5-methylene-6H-pyrimidine 2,4-dione derivatives in moderate to good yields. These products behaved as good Michael acceptors towards a variety of nucleophiles such as bromine, hydrochloric acid, hydrides, etc. A plausible mechanism is proposed based on theoretical approaches and
碳二亚胺在非常温和的条件下在两个N原子处与2-(溴甲基)丙烯酸反应,以中等至良好的产率得到1,3-二取代的-5-亚甲基-6 H-嘧啶2,4-二酮衍生物。这些产品对各种亲核试剂(如溴,盐酸,氢化物等)表现出良好的迈克尔受体作用。基于理论方法和实验结果,提出了一种合理的机制。