A compact and regioselective approach to 2-substituted isoflav-3-enes based on a preformed 2-unsubstituted isoflavene is described. Isoflavene oxidation by hydride ion abstraction to the corresponding isoflavylium salt using trityl hexafluorophosphate followed by nucleophilic addition to the 2-position resulted in the introduction of a range of substituent groups in generally moderate to good yields.
一种基于预制的2-未取代异
黄酮的紧凑且区域选择性的方法,用于合成2-取代异黄烯-3-烯。通过氢离子抽提将异黄烯氧化为相应的异黄烷阳离子盐,使用三苯基
六氟磷酸盐,随后在2位添加亲核试剂,引入了一系列取代基,通常获得适中到良好的产率。