acetates catalyzed by α-isocupreine is reported. It provides chiral isoxazoline N-oxides in moderate to good yields with 88-99% ee, and represents the first catalytic asymmetric (4 + 1) annulation of activated nitroalkenes with in situ generated ammonium ylides. It also affords a practical and efficient access to chiral isoxazoline N-oxides.
据报道,α-异
肉桂酸催化α-硝基
肉桂酸酯与森田-贝利斯-希尔曼(MBH)
乙酸盐的不对称环化(4 +1)。它以88-99%ee的中度到良好收率提供手性
异恶唑啉N-氧化物,并且代表了活化的硝基烯烃与原位生成的
铵化
铵的首次催化不对称(4 +1)环化反应。它还提供了实用有效的手性
异恶唑啉N-氧化物的途径。