The Hydroboration of Propargyl Bromide. Simple One-Pot Three-Component Routes to (<i>Z</i>)-1-Bromoalk-1-en-4-ols and to <i>a</i><i>nti</i>-Homoallylic Alcohols
作者:Marco Lombardo、Stefano Morganti、Claudio Trombini
DOI:10.1021/jo005633a
日期:2000.12.1
toward either the synthesis of (Z)-1-bromoalk-1-en-4-ols 6 or anti-homoallylic alcohols 8. Two one-pot three-component processes were developed based on a sequence of four reactions; preparation of dialkylborane and hydroboration of propargyl bromide are the first steps. Then, quaternization with TEBABr may be carried out either in the presence of the aldehyde when (Z)-1-bromoalk-1-en-4-ols 6 are requested
炔丙基溴与二烷基硼烷的氢硼化选择性地产生3-溴丙-1-烯-1-基二烷基硼烷13,其在与溴化物离子季铵化后经历一系列转化成许多烯丙基硼物种。通过实验条件的适当选择,能够捕获的反应中间体与醛和朝向的(Z)或者所述合成操纵过程-1- bromoalk -1-烯-4-醇6或抗高烯丙基醇8 。基于四个反应序列,开发了两个一锅三组分工艺;第一步是制备二烷基硼烷和炔丙基溴的硼氢化。然后,当需要(Z)-1-bromoalk-1-en-4-ols 6时,可以在醛存在下用TEBABr进行季铵化,