Asymmetric Hydrovinylation of Vinylindoles. A Facile Route to Cyclopenta[<i>g</i>]indole Natural Products (+)-<i>cis</i>-Trikentrin A and (+)-<i>cis</i>-Trikentrin B
作者:Wang Liu、Hwan Jung Lim、T. V. RajanBabu
DOI:10.1021/ja3004733
日期:2012.3.28
Vinylindoles undergo Ni(II)-catalyzed asymmetric hydrovinylation under very mild conditions (-78 °C, 1 atm ethylene, 4 mol % catalyst) to give the corresponding 2-but-3-enyl derivatives in excellent yields and enantioselectivities. Hydroboration of the alkene and oxidation to an acid, followed by Friedel-Craftsannulation, gives an indole-annulated cyclopentanone that is a suitable precursor for the