Use of Lithium Hexafluoroisopropoxide as a Mild Base for Horner−Wadsworth−Emmons Olefination of Epimerizable Aldehydes
作者:Landy K. Blasdel、Andrew G. Myers
DOI:10.1021/ol051785m
日期:2005.9.1
[reaction: see text] The weak base lithium 1,1,1,3,3,3-hexafluoroisopropoxide (LiHFI) is shown to be highly effective as a reagent for intermolecular Horner-Wadsworth-Emmons (HWE) olefination of epimerizable aldehydes with trimethyl phosphonoacetate, affording products with little or no epimerization and notably high E-selectivity.
[反应:请参见文本]弱碱1,1,1,3,3,3-六氟异丙醇锂(LiHFI)被证明可高效地用作可扩散醛的分子间Horner-Wadsworth-Emmons(HWE)烯化反应的试剂。三甲基膦酰基乙酸酯,提供几乎没有或没有差向异构化的产物,并且具有很高的E选择性。