Different alkyl/aryl 7-hydroxy-8-coumarinyl ketones were converted to 7-O-allyl and 7-O-cyclohexenyl ethers and the study of hitherto unreported sigmatropic rearrangement on 7-O-allyl and 7-O-cyclohex-2'-ene-1'-ylcoumarinyl ketones prepared is accounted herein. The rearrangement yielded alkyl/aryl 6-allyl-7-hydroxy-8-coumarinyl ketones 3 and alkyl/aryl 6-cyclohex-2'-en-1'-yl-7-hydroxy-8-coumarinyl ketones 7 as the major products. Interestingly, unusual selectivity was observed in the case of alkyl 7-O-allylcoumarinyl ketones. Thus alkyl 3-allyl-7-hydroxy-8-coumarinyl ketones 4 and alkyl 8-allyl-7-hydroxy-6-coumarinyl ketones 5 were the outcome from alkyl 7-O-allyl-8-coumarinyl ketones and alkyl 4-methyl-7-O-allyl-8-coumarinyl ketones, respectively, albeit in minor yields.Key words: allyloxycoumarinyl ketones, 7-O-cyclohex-2'-en-1'-ylcoumarinyl ketones, sigmatropic rearrangement, 3-allylcoumarinyl ketones, 8-allylcoumarinyl ketones.
不同的烷基/芳基 7-羟基-8-香豆素酮被转化为 7-O-烯丙基醚和 7-O-环己烯基醚,本文介绍了对所制备的 7-O-烯丙基和 7-O-环己烯-2'-烯-1'-基香豆素酮进行的迄今未报道的对称重排的研究。重排的主要产物是烷基/芳基 6-烯丙基-7-羟基-8-香豆素酮 3 和烷基/芳基 6-环己-2'-烯-1'-基-7-羟基-8-香豆素酮 7。有趣的是,在烷基 7-O-烯丙基香豆素酮中观察到了不同寻常的选择性。因此,3-烯丙基-7-羟基-8-香豆素酮烷基 4 和 8-烯丙基-7-羟基-6-香豆素酮烷基 5 分别是 7-O-烯丙基-8-香豆素酮烷基和 4-甲基-7-O-烯丙基-8-香豆素酮烷基的产物,尽管产率较低。关键词:烯丙基香豆素酮、7-O-环己-2'-烯-1'-基香豆素酮、对称重排、3-烯丙基香豆素酮、8-烯丙基香豆素酮。