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 catalyzedcycloaddition 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