Synthesis of 1,1,4,4-Tetrabromo-2-butenes and Related Compounds via Desilylation−Bromination of Silylated 1,3-Butadiene Derivatives
作者:Zhenfeng Xi、Xiaozhong Liu、Jianming Lu、Fengyu Bao、Hongtao Fan、Zhiping Li、Tamotsu Takahashi
DOI:10.1021/jo048940f
日期:2004.11.1
The combination of zirconocene-mediated coupling of silylated alkynes with a protonation−desilylation or bromination−desilylation process afforded otherwise unavailable butadiene derivatives. When (E,E)-2,3-dialkyl-1,4-bis(trimethylsilyl)-1,3-butadienes were treated with 3 equiv of Br2 in CH2Cl2, (E)-2,3-dialkyl-1,1,4,4-tetrabromo-2-butenes were obtained in excellent yields with perfect stereoselectivity
锆茂茂介导的甲硅烷基化炔烃的偶合与质子化-去甲硅烷基化或溴化-去甲硅烷基化过程的结合提供了否则无法得到的丁二烯衍生物。当在CH 2 Cl 2中用3当量的Br 2处理(E,E)-2,3-二烷基-1,4-双(三甲基甲硅烷基)-1,3-丁二烯时,(E)-2,3-二烷基以优异的产率和完美的立体选择性获得了-1,1,4,4-四溴-2-丁烯。