A nickel(0) catalyzed cycloaddition of alkynes and isocyanates that affords pyrimidine-diones
作者:Hung A. Duong、Janis Louie
DOI:10.1016/j.tet.2006.03.119
日期:2006.8
carbene catalyzed cycloaddition of one alkyne and two isocyanates that affords pyrimidine-dione is described. The key to the success of this protocol is the use of unsymmetrically substituted alkynes that favors the formation of pyrimidine-diones over pyridones. A variety of pyrimidine-diones were prepared. A one-pot cycloaddition and Stille coupling were reported for tributyl(1-propynyl)tin. Competition
描述了一种提供炔嘧啶-二酮的Ni / N-杂环卡宾催化的一个炔烃和两个异氰酸酯的环加成。该协议成功的关键是使用不对称取代的炔烃,它比嘧啶酮更易于形成嘧啶-二酮。制备了各种嘧啶-二酮。报道了三丁基(1-丙炔基)锡的一锅环加成和Stille偶联。竞争研究还提供了环加成机理的见解。