Diastereo- and Enantioselective Iridium-Catalyzed Carbonyl Propargylation from the Alcohol or Aldehyde Oxidation Level: 1,3-Enynes as Allenylmetal Equivalents
作者:Laina M. Geary、Sang Kook Woo、Joyce C. Leung、Michael J. Krische
DOI:10.1002/anie.201200239
日期:2012.3.19
chirality transfer: Exposure of conjugated enynes to alcohols in the presence of an iridium catalyst modified by a segphos ligand results in the generation of aldehyde–allenyliridium pairs and formation of enantiomerically enriched products of carbonyl anti‐(α‐methyl)propargylation (see scheme). An identical set of products are obtained from aldehydes under related transfer hydrogenation conditions by
轴向到轴向至点的手性转移:在被segphos配体修饰的铱催化剂存在下,共轭烯炔与醇的接触导致醛-烯基铱对的生成以及对映体富集的羰基抗-(α-甲基)产物炔丙基化(参见方案)。通过使用甲酸作为还原剂,在相关的转移氢化条件下,从醛中获得了相同的一组产物。