Asymmetric Synthesis of Axially Chiral 1-Aryl-5,6,7,8-tetrahydroquinolines by Cobalt-Catalyzed [2 + 2 + 2] Cycloaddition Reaction of 1-Aryl-1,7-octadiynes and Nitriles
作者:Marko Hapke、Karolin Kral、Christine Fischer、Anke Spannenberg、Andrey Gutnov、Dmitry Redkin、Barbara Heller
DOI:10.1021/jo100122d
日期:2010.6.18
The asymmetric synthesis of a range of axially chiral 2-arylpyridines by a cobalt-catalyzed [2 + 2 + 2] cycloaddition reaction is described. The use of a planar chiral (1-neomenthylindenyl)cobalt(COD) complex under photochemical conditions is the key for reacting the 1-naphthyldiynes with a range of differently functionalized nitriles, giving the enantiomeric atropoisomers with high chemical yields
描述了通过钴催化的[2 + 2 + 2]环加成反应的一系列轴向手性2-芳基吡啶的不对称合成。在光化学条件下使用平面手性(1-新薄荷基)钴(COD)配合物是使1-萘二炔与一系列不同官能化的腈反应的关键,从而使对映异构的对映异构体具有很高的化学收率并且对映异构体过量高达94%ee。