Simple, Stable, and Versatile Double-Allylation Reagents for the Stereoselective Preparation of Skeletally Diverse Compounds
作者:Feng Peng、Dennis G. Hall
DOI:10.1021/ja068985t
日期:2007.3.1
A new and efficient class of double-allylation reagents, α-trimethylsilylmethyl allylboronate 1 and the crotylboronates 12, is reported. These stable bimetallic reagents are prepared easily in enantiomerically pure form and add under BF3 catalysis onto a wide range of aldehydes to afford a direct access to hydroxyl-functionalized allylic silanes in very high E/Z selectivity and excellent enantioselectivity
报道了一类新型有效的双烯丙基化试剂,α-三甲基甲硅烷基甲基烯丙基硼酸酯 1 和巴豆基硼酸酯 12。这些稳定的双金属试剂很容易以对映体纯形式制备,并在 BF3 催化下添加到各种醛上,以非常高的 E/Z 选择性和出色的对映选择性(高达 98% ee)直接获得羟基官能化的烯丙基硅烷. 有用的羟基官能化烯丙基硅烷中间体可用于各种化合物类别的化学发散合成,例如无环丙酸酯单元、多取代呋喃、乙烯基环丙烷和更大的碳环。