A Strictly “Pair”-Selective Synthesis of Conjugated Diynes via Pd-Catalyzed Cross Coupling of 1,3-Diynylzincs: A Superior Alternative to the Cadiot−Chodkiewicz Reaction
作者:Ei-ichi Negishi、Mitsuhiro Hata、Caiding Xu
DOI:10.1021/ol000270m
日期:2000.11.1
A strictly "pair"-selective synthesis of conjugated diynes via Pd-catalyzed cross coupling of 1,3-diynylzincs is described. This method, like the Cadiot-Chodkiewicz reaction, requires three steps for the synthesis of R(1)Ctbd1;CCtbd1;CR(2) from R(1)Ctbd1;CH, R(2)X, and HCtbd1;CH. However, the high "pair"-selectivity permitting high-yield production of the desired conjugated diynes without separation
描述了通过Pd催化的1,3-二炔基锌的交叉偶联的严格“成对”选择性合成共轭二炔。与Cadiot-Chodkiewicz反应一样,此方法需要三个步骤才能从R(1)Ctbd1; CH,R(2)X和HCtbd1; CH合成R(1)Ctbd1; CCtbd1; CR(2)。然而,高“对”选择性允许在不分离对称二炔的情况下高产率地生产所需的共轭二炔,有望使本方案在许多情况下优于Cadiot-Chodkiewicz反应。