Palladium-catalyzed cross-coupling reaction of alkynylzincs with benzylic electrophiles
作者:Mingxing Qian、Ei-ichi Negishi
DOI:10.1016/j.tetlet.2005.02.137
日期:2005.4
The reaction of alkynylzinc bromides with benzyl bromides or chlorides in the presence of a catalytic amount of Pd(DPE-phos)Cl-2 in THF at 23 degrees C cleanly produces the corresponding benzylated alkynes in 73-97% yields. With 10(-3) mol% of Pd(DPE-phos)Cl-2, the maximum turnover number of 7.1 x 10(4) has been observed for the formation of PhC CCH2Ph. (c) 2005 Published by Elsevier Ltd.
Selective palladium-catalysed substitution of 1,1-dichloroethylene