The stereoselective α-alkylation of chiral β-hydroxy esters and some applications thereof
作者:G. Fráter、U. Müller、W. Günther
DOI:10.1016/s0040-4020(01)82413-3
日期:1984.1
The stereoselectivity of the α-alkylation of chiral β-hydroxy ester is discussed. The configuration of the alkylated product was proved chemically (Scheme 2). A one pot aldol-alkylation reaction was developed leading stereoselectively to racemic (s*,s*)-α-alkyl-β-hydroxy ester (Scheme 3,4). Baker's yeast reduction of 2-alkyl-3-keto ester led to valuable chiral (2RS,3S)-intermediates, which were converted
讨论了手性β-羟基酯的α-烷基化的立体选择性。通过化学方法证明了烷基化产物的构型(方案2)。进行了一锅羟醛烷基化反应,立体选择性地生成了外消旋(s *,s *)-α-烷基-β-羟基酯(方案3,4)。贝克的2-烷基-3-酮酯的酵母还原反应产生了有价值的手性(2 RS,3 S)中间体,该中间体通过相应的二价阴离子转化为具有手性季C原子的化合物(方案6)。上述发现的合成应用显示在各种手性化合物的合成中(方案8和9)。