Enantioselective Addition of Boronates to <i>o</i>‑Quinone Methides Catalyzed by Chiral Biphenols
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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′-Br2-BINOL. A two-step synthesis of (S)-4-methoxydalbergione in good yield and selectivity was achieved.
创建时间：
2012-12-12
