Mesyloxy-Group Migration as the Stereoselective Preparation Method of Various Functionalized Olefins and Its Reaction Mechanism
作者:Takashi Yamazaki、Shuichi Hiraoka、Johei Sakamoto、Tomoya Kitazume
DOI:10.1021/ol007060u
日期:2001.3.1
[structure: see text]. It was demonstrated that mesylation of appropriate gamma,gamma-difluorinated allylic alcohols under usual conditions furnished the corresponding alpha,alpha-difluorinated allylic mesylates, possibly by way of 1,3-mesyloxy-group migration after formation of the expected "normal" intermediates, gamma,gamma-difluorinated allylic mesylates. This rearrangement was conveniently applied
[结构:见文字]。已证明适当的γ,γ-二氟代烯丙基醇在常规条件下的甲磺酸化提供了相应的α,α-二氟代烯丙基甲磺酸酯,可能通过预期的“正常”中间体形成后的1,3-甲氧基基团迁移, γ,γ-二氟代烯丙基甲磺酸酯。这种重排可以方便地应用于三取代的烯丙醇,α,β-不饱和酯,酰胺或酮的构建,具有良好的化学收率和优异的E选择性。