Chiral Phosphoric Acid-Catalyzed Enantioselective Aza-Friedel–Crafts Reaction of Indoles
作者:Masahiro Terada、Shigeko Yokoyama、Keiichi Sorimachi、Daisuke Uraguchi
DOI:10.1002/adsc.200700151
日期:2007.8.6
A highly enantioselective 1,2-aza-Friedel–Crafts reaction of N-tert-butyldimethylsilylindole with N-tert-butoxycarbonyl aromatic imines is demonstrated using a BINOL-derived monophosphoric acid catalyst. The present approach provides efficient access to 3-indolylmethaneamines with aryl substituents in excellent enantioselectivities (up to 98 % ee). An inversion in the sense of enantioselection was
的对映体选择性高1,2-氮杂Friedel-Crafts反应ñ -叔-butyldimethylsilylindole与ñ -叔丁氧羰基的芳族亚胺是使用BINOL衍生的单磷酸催化剂证实。本方法提供了以优异的对映选择性(最高达98%ee)有效地获得具有芳基取代基的3-吲哚基甲胺。在对映体意义上的反转被发现在带有在双萘基骨架的3,3'-位置引入的不同取代基的单磷酸催化剂之间。我们还计算了单磷酸催化剂的三维结构,以推测立体化学结果的反演。