Chromium(II)-mediated Barbier condensation of β-iodovinyl p-tolylsulfone with aldehydes and β-ionone afforded the title hydroxysulfones in good to excellent yields.
铬 (II) 介导的 β-碘乙烯基对甲苯基砜与醛和 β-紫罗兰酮的 Barbier 缩合以良好至极好的产率提供标题羟基砜。
High 1,2-Asymmetric Induction in Radical Reactions: Radical Addition to<i>γ</i>-Hydroxy<i>α</i>,<i>β</i>-Unsaturated Carboxylic Esters and Sulfones
作者:Katsuyuki Ogura、Akio Kayano、Motohiro Akazome
DOI:10.1246/bcsj.70.3091
日期:1997.12
High 1,2-asymmetric induction was realized by the addition of a 1-hydroxy-1-methylethyl radical to conformationally flexible (E)-γ-hydroxy α,β-unsaturated carboxylic esters and sulfones (1 and 2, respectively). Upon the irradiation (> 290 nm) of (E)-1 and benzophenone in 2-propanol, the 1-hydroxy-1-methylethyl radical was generated in situ and added to (E)-1 with high anti-stereoselectivity. The bulkier