Novel diastereoselective synthesis of (E)- and (Z)-allylsilanes via organoboranes
作者:Narayan G. Bhat、Wendy C. Lai、Matthew B. Carroll
DOI:10.1016/j.tetlet.2007.04.052
日期:2007.6
A simple, novel diastereoselective synthesis of both (E)- and (Z)-allylsilanes via organoboranes is developed. (E)-1-Alkenylboronate esters easily prepared from the corresponding terminal alkynes via hydroboration with dibromoborane-methyl sulfide complex followed by treatment with 1,3-propane diol readily react with trimethylsilylmethyllithium at −78 °C in methanol followed by reaction with iodine
通过有机硼烷开发了一种简单,新颖的非对映选择性合成(E)-和(Z)-烯丙基硅烷的方法。(E)-1-烯基硼酸酯很容易从相应的末端炔烃经二溴硼烷-甲基硫醚络合物加氢硼化制得,然后用1,3-丙二醇处理,很容易在-78°C下与三甲基甲硅烷基甲基锂在甲醇中反应,然后与碘反应。甲醇以高收率(72–80%)和高立体化学纯度(CMR光谱数据证明为98%)生产相应的(Z)-烯丙基硅烷。同样,(Z)-1-烯基硼酸酯在甲醇中于-78°C与三甲基甲硅烷基甲基锂反应,然后在甲醇中用碘处理,以适度收率(57-65%)以高立体化学纯度(大于98%生成)生成相应的(E)-烯丙基硅烷通过CMR光谱数据显示)。