Stereoselective Synthesis of Difunctionalized 1,3-Dienes Containing Tin and Sulfonyl Groups by Palladium-Catalyzed Regio- and Stereocontrolled Addition Reactions
作者:Hong Zhao、Weisen Yang、Shiyun Xie、Mingzhong Cai
DOI:10.1002/ejoc.201101153
日期:2012.2
Using palladium-catalyzed addition reactions, a terminal alkyne, an acetylenic sulfone, and a tin hydride comprise the building blocks for the construction of difunctionalized 1,3-dienes containing tin and sulfonyl groups in an atom-economical fashion. Terminal alkynes 1 undergo clean cis addition to acetylenic sulfones 2 in the presence of catalytic amounts of palladium acetate and tri(2,6-dimethoxyphenyl)phosphane
使用钯催化的加成反应,末端炔烃、炔砜和氢化锡构成了以原子经济方式构建含有锡和磺酰基的双官能化 1,3-二烯的结构单元。在催化量的乙酸钯和三(2,6-二甲氧基苯基)膦存在下,末端炔烃 1 与炔砜 2 发生完全顺式加成,以优异的产率得到 (E)-1-磺酰基取代的 1,3-烯炔烃 3 . 在 Pd(PPh3)4 的存在下,1,3-烯炔 3 与氢化三丁基锡的氢化甲硅烷基化以优异的产率提供了区域和立体选择性 (1E,3E)-1-磺酰基-3-三丁基甲锡烷基取代的 1,3-二烯 4。