Development of a New Reaction System for the Synthesis of Highly Optically Active α,γ-Substituted γ-Butyrolactones
作者:Ming-Hua Xu、Wei Wang、Li-Jun Xia、Guo-Qiang Lin
DOI:10.1021/jo0155153
日期:2001.6.1
A highly useful method for the synthesis of optically active alpha,gamma-substituted gamma-butyrolactones has been developed. The SmI(2)-induced reductive coupling of chiral 2-alkyl acrylates derived from isosorbide with ketones in the presence of (1S)-(-)-2,10-camphorsultam as a proton source give the chiral alpha,gamma-substituted gamma-butyrolactones in good yields and high enantiomeric purities
已经开发了用于合成旋光的α,γ-取代的γ-丁内酯的非常有用的方法。SmI(2)诱导的异山梨醇与酮的手性2-烷基丙烯酸2-烷基酯的还原偶联,在存在(1S)-(-)-2,10-樟脑作为质子源的情况下,得到手性α,γ取代的γ -丁内酯,收率高,对映体纯度高(反式可高达99%ee,顺式可高达75%ee)。已经用各种酮研究了该反应系统,并且证明该系统对于反式α,γ-取代的γ-丁内酯是非常有效的。为了观察到优异的产品ee值,该系统中的手性助剂和受阻质子源都是必需的。