(<i>Z</i>)-Selective Enol Triflation of α-Alkoxyacetoaldehydes: Application to Synthesis of (<i>Z</i>)-Allylic Alcohols via Cross-Coupling Reaction and [1,2]-Wittig Rearrangement
作者:Fumiya Kurosawa、Takeo Nakano、Takahiro Soeta、Kohei Endo、Yutaka Ukaji
DOI:10.1021/acs.joc.5b00647
日期:2015.6.5
corresponding (Z)-vinyl triflates was achieved by treatment with phenyl triflimide and DBU. The stereochemistry was explained by the “syn-effect,” which was attributed primarily to an σ → π* interaction. The β-alkoxy vinyl triflates obtained were applied to the stereoselective synthesis of structurally diverse (Z)-allylic alcohols via transition metal-catalyzed cross-coupling reaction and [1,2]-Wittig
α-烷氧基乙醛向相应的(Z)-乙烯基三氟甲磺酸酯的立体选择性转化是通过用三氟甲苯苯基酯和DBU处理而实现的。立体化学由“顺效应”解释,“顺效应”主要归因于σ→π*相互作用。通过过渡金属催化的交叉偶联反应和[1,2] -Wittig重排,将获得的β-烷氧基乙烯基三氟甲磺酸酯用于结构多样的(Z)-烯丙基醇的立体选择性合成。