Enantioselective Addition of Boronates to <i>o</i>-Quinone Methides Catalyzed by Chiral Biphenols
作者:Yi Luan、Scott E. Schaus
DOI:10.1021/ja309076g
日期:2012.12.12
Chiralbiphenols were found to catalyze the enantioselective asymmetric addition of aryl- or alkenylboronates to o-quinone methides. Substituted 2-styryl phenols were obtained in good yields (up to 95%) with high enantiomeric ratios (up to 98:2) in the presence of 10 mol % 3,3'-Br(2)-BINOL. A two-step synthesis of (S)-4-methoxydalbergione in good yield and selectivity was achieved.