The reaction of trimethylsilyl ethylene oxide with α-sulfonyl anions and α,α-sulfonyl dianions. A method for stereocontrolled synthesis of (E)- and (Z)-allylic alcohols
作者:Pawel Jankowski、Stanislaw Marczak、Marek Masnyk、Jerzy Wicha
DOI:10.1016/0022-328x(91)83086-j
日期:1991.2
and expulsion of the benzenosulfonyl anion. The reaction of trimethylsilyl ethylene oxide with α,α-sulfonyl dianions followed by partial protonation of the immediate adducts affords O-trimethylsilyl allylic alcohols, mainly (E)-isomers. The reaction of trimethylsilyl ethylene oxide with α-sulfonyl carbanions generated from secondary alkyl phenyl sulfones affords α-trimethylsilyl carbinols as the only
已经显示三甲基甲硅烷基环氧乙烷与由代表性的伯烷基苯基砜产生的α-磺酰基碳负离子反应,以得到具有更高选择性的(Z)-异构体的相应的O-三甲基甲硅烷基烯丙基醇。该反应通过亲核试剂与α,β-环氧烷基硅烷的α-位连接,然后碳-氧转移至三甲基甲硅烷基,并排出苯甲磺酰基阴离子而进行。三甲基甲硅烷基环氧乙烷与α,α-磺酰基二价阴离子的反应,然后将直接加合物部分质子化,主要得到O-三甲基甲硅烷基烯丙基醇(E)异构体。三甲基甲硅烷基环氧乙烷与由仲烷基苯基砜生成的α-磺酰基碳负离子的反应提供了α-三甲基甲硅烷基甲醇为唯一或主要产物。在这种情况下,亲核试剂的附着发生在α,β-环氧烷基硅烷的β位置。讨论了磺酰基碳负离子与α,β-环氧烷基硅烷反应中区域和立体选择性的起源。