Nickel-Catalyzed [2+2+2] Cycloaddition of Diynes and Cyanamides
作者:Ryan M. Stolley、Michael T. Maczka、Janis Louie
DOI:10.1002/ejoc.201100428
日期:2011.7
A variety of bicyclic N,N-disubstituted 2-aminopyridines have been prepared from diynes and cyanamides by nickel-catalyzed [2+2+2] cycloaddition reactions. The reactions proceeded at room temperature with low catalyst loading to afford 2-aminopyridines in good to excellent yields. The method is amenable to both internal and terminal diynes and proceeds in a regioselective manner. A number of cyanamides