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
Chiral biphenols 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.
发现手性双酚催化芳基或链烯基硼酸酯与邻醌甲基化物的对映选择性不对称加成。在 10 mol% 3,3'-Br(2)-BINOL 存在下,以高对映体比(高达 98:2)获得了高产率(高达 95%)的取代 2-苯乙烯基苯酚。以良好的产率和选择性实现了 (S)-4-甲氧基丹参的两步合成。