<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)acrylicacid 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