Mild and Selective Palladium-Catalyzed Dimerization of Terminal Alkynes To Form Symmetrical (<i>Z</i>,<i>Z</i>)-1,4-Dihalo-1,3-dienes
作者:Jin-Heng Li、Yun Liang、Ye-Xiang Xie
DOI:10.1021/jo0486645
日期:2004.11.1
A regioselective and stereoselective palladium-catalyzed dimerization of terminal alkynes method for the synthesis of symmetrical (Z,Z)-1,4-dihalo-1,3-dienes is presented. In the presence of a catalytic amount of PdX2 and 3 equiv of CuX2 (X = Cl and Br), terminal alkynes were dimerized to afford (Z,Z)-1,4-dihalo-1,3-dienes in good yields. The results showed that the effect of solvent had a fundamental
提出了区域炔和立体选择性钯催化的末端炔烃二聚方法,用于合成对称的(Z,Z)-1,4-二卤代-1,3-二烯。在催化量的PdX 2和3当量的CuX 2(X = Cl和Br)存在下,将末端炔烃二聚,以高收率得到(Z,Z)-1,4-dihalo-1,3-dienes 。结果表明,溶剂的影响对二聚反应的化学选择性具有根本性的影响。还讨论了钯催化的二聚反应的机理。