The direct C−H alkynylation of azoles with alkynyl bromides proceeds efficiently in the presence of a nickel-based catalyst system. The reaction enables the introduction of various alkynyl groups bearing aryl, alkenyl, alkyl, and silyl substituents to the azole cores. In some cases, addition of a catalytic amount of CuI is observed to accelerate the direct coupling dramatically.
Palladium-Catalyzed Direct C–H Bond Alkynylations of Heteroarenes Using <i>gem</i>-Dichloroalkenes
作者:Lutz Ackermann、Christoph Kornhaass、Yingjun Zhu
DOI:10.1021/ol300514d
日期:2012.4.6
Palladium-catalyzed direct alkynylations of heteroarenes were accomplished with inexpensive gem-dichloroalkenes as user-friendly electrophiles, which set the stage for a modular, step-economical synthesis of diversely decorated heteroaryl alkynes with ample scope.