Stereoselective Formation of Carbon−Carbon Bonds via S<sub>N</sub>2-Displacement: Synthesis of Substituted Cycloalkyl[<i>b</i>]indoles
作者:Michael C. Hillier、Jean-François Marcoux、Dalian Zhao、Edward J. J. Grabowski、Arlene E. McKeown、Richard D. Tillyer
DOI:10.1021/jo051146p
日期:2005.10.1
A general asymmetric synthesis of substituted cycloalkyl[b]indoles has been accomplished. The key features of this approach are (1) the utilization of a Japp−Klingemann condensation/Fischer cyclization to prepare cycloalkyl[b]indolones, (2) the asymmetric borane reduction of these heterocyclic ketones with (S)-OAB to obtain enantiomerically pure alcohols, and (3) the stereoselective SN2-displacement
已经完成了取代的环烷基[ b ]吲哚的一般不对称合成。该方法的关键特征是:(1)利用Japp-Klingemann缩合/菲舍尔环化反应制备环烷基[ b ]吲哚酮,(2)用(S)-OAB将这些杂环酮不对称还原成硼烷,得到对映体纯(3)在Mitsunobu条件下用碳亲核试剂将这些吲哚醇底物的立体选择性S N 2-置换,以设定C 1或C 3叔碳立体中心。使用三甲基膦(PMe 3)和偶氮二羧酸双(2,2,2-三氯乙基)酯(TCEAD)对Mitsunobu脱水烷基化有影响。