Anti-α,β-dihydroxy thioesters are prepared with excellent enantioselectivities by the asymmetric aldol reaction between both achiral aldehydes and silyl enol ethers derived from α-benzyloxy thioesters in the presence of a chiral promoter consisted of chiral diamine coordinated tin(II) triflate and dibutyltindiacetate.
Preparation of both enantiomers of 2-methyl-3-hydroxythioesters based on chiral Lewis acid-controlled synthesis
作者:Shu Kobayashi、Mineko Horibe
DOI:10.1016/0040-4020(96)00251-7
日期:1996.5
Bothenantiomers of 2-methyl-3-hydroxythioesters have been synthesized by using chiral tin(II) Lewis acid-mediated aldol reactions of (Z)-1-ethylthio-1-trimethylsiloxypropene (4) with aldehydes, based on chiral Lewis acid-controlled synthesis. The key to this synthesis is in choosing similar types of chiral sources, (S)-1-methyl-2-[(1-benz[cd]indolinyl]pyrrolidine (3) and (S)-1-methyl-2-[(1-naphth
2-甲基-3-羟基硫代酸酯的两种对映异构体均是基于手性路易斯酸-的手性锡(II)路易斯酸介导的(Z)-1-乙基硫基-1-三甲基甲硅烷氧基丙烯(4)与醛的醛醇缩合反应合成的。受控合成。合成的关键是选择类似类型的手性来源,(S)-1-甲基-2-[(1-苯并[ cd ]吲哚基]吡咯烷(3)和(S)-1-甲基-2- [ (1-萘基氨基)甲基]吡咯烷(5),衍生自L-脯氨酸,还描述了在不对称醛醇缩合反应中新的手性配体3的评价。