Catalytic asymmetric synthesis ofSecondary (E)-allyl alcohols from acetylenes and aldehydesvia (1-alkenyl)zinc intermediates. Preliminary Communication
作者:Wolfgang Oppolzer、Rumen N. Radinov
DOI:10.1002/hlca.19920750114
日期:1992.2.5
mol-equiv., hexane), treatment of the resulting [(E)-1-alkenyl]boranes 5 with Et2Zn or Me2Zn (1.05 mol-equiv.) followed by addition of (−)-3-exo-(dimethylamino)isoborneol (DAIB, 8; 0.01 mol-equiv.), subsequent addition of a solution of an aromatic or aliphatic aldehyde (1 mol-equiv., hexane), and quenching with aq. NH4Cl provided (E)-allyl alcohols 6 usually in 70–95% yield with 79–98% enantiomeric
用新鲜制备的二环己基硼烷(1摩尔当量,己烷)对脂肪族1-炔烃进行硼氢化,用Et 2 Zn或Me 2 Zn(1.05摩尔当量)处理所得的[(E)-1-烯基]硼烷5。然后加入(-)-3-外-(二甲基氨基)异冰片醇(DAIB,8 ; 0.01摩尔当量),随后加入芳香或脂族醛溶液(1摩尔当量,己烷),和用水溶液淬灭。NH 4 Cl提供的(E)-烯丙基醇6的收率通常为70-95%,对映体过量为79-98%(方案3和表)。