Asymmetric conjugate addition of organometallic reagents to chiral α, β-unsaturated esters
作者:Chenglin Fang、Tomoyuki Ogawa、Hiroshi Suemune、Kiyoshi Sakai
DOI:10.1016/s0957-4166(00)82125-4
日期:1991.1
Asymmetric conjugate addition to α,β-unsaturated ester was studied using four kinds of cyclic diols (1c–4c) as chiral auxiliaries. Among the tested substrates, (R,R)-cyclohexane-1,2-diol derivatives (6a–c) and (1R,2S)-2-hydroxymethylcyclopentanol derivative (7a) showed high and reverse diastereoselectivity in conjugate addition by organocuprates (R2CuLi) and/or Grignard reagents in the presence of
使用四种环状二醇(1c–4c)作为手性助剂,研究了α,β-不饱和酯的不对称共轭加成。在测试的底物中,(R,R)-环己烷-1,2-二醇衍生物(6a–c)和(1 R,2 S)-2-羟甲基环戊醇衍生物(7a)在通过有机铜化合物加成共轭物中表现出高非对映选择性。 (R 2 CuLi)和/或格氏试剂分别在碘化铜(RMgBr + CuI)的存在下进行。