作者:Dervilla M.X Donnelly、Jean-Pierre Finet、Patrick J Guiry、Karl Nesbitt
DOI:10.1016/s0040-4020(00)00955-8
日期:2001.1
3-one with aryllead triacetates gave the 4-aryl derivatives after 3-4 h reaction times in moderate to good yields. Unexpectedly, 2,4-diarylated derivatives were also obtained after longer reaction times. The activating methyl ester group proved difficult to remove by standard decarboxylation procedures. 4-Benzyloxycarbonylchroman-3-ones were therefore prepared and reacted with aryllead triacetates
4-甲氧基羰基苯并二氢吡喃-3-酮与三乙酸芳基铅的反应在3-4小时反应时间后以中等至良好的产率得到4-芳基衍生物。出乎意料的是,在更长的反应时间之后也获得了2,4-二芳基化的衍生物。事实证明,很难通过标准的脱羧程序除去活化的甲酯基团。因此制备了4-苄氧基羰基苯并二氢吡喃-3-酮,并与三乙酸芳基铅反应,得到相应的4-芳基衍生物。随后将它们脱羧,还原和脱水,以适中的总收率得到新黄酮。