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
Nickel-Catalyzed Cycloaddition of Alkynes and Isocyanates
作者:Hung A. Duong、Michael J. Cross、Janis Louie
DOI:10.1021/ja046477i
日期:2004.9.1
A mild and general route for preparing 2-pyridones from isocyanates and diynes is described. Ni imidazolyidene complexes were used to mediate cyclizations between both internal and terminal diynes with aryl and alkyl isocyanates. In addition, the efficacy of this protocol allows for the preparation of a fused seven-membered pyridone and for three component cyclizations.
Nickel(0)-katalysierte [2+2+2′]-Cycloaddition von Alkynen mit Isocyanaten zu 2-Oxo-1,2-dihydropyridinen
作者:Heinz Hoberg、Benno W. Oster
DOI:10.1055/s-1982-29800
日期:——
HOBERG, H.;OSTER, B. W., SYNTHESIS, BRD, 1982, N 4, 324-325