The baeyer-villiger reaction of strained cage compounds, 1,3-bishomocubanones, via carbocations
作者:Hidetoshi Miura、Ken-ichi Hirao、Osamu Yonemitsu
DOI:10.1016/0040-4020(78)80212-9
日期:1978.1
lactones (2d, 2e, 2f, 4d, 4e, 4f). In these oxidations, the mechanism via carbocations, cyclobutyl 18 and cyclopropylcarbinyl cations 19, plays a major role different from the ordinary concerted migration mechanism. Solvent effects, kinetic treatments, and methyl substituent effects on product ratios support this carbocation mechanism. The adduct formation process between a ketone and m-CPBA must be
在室温下,用间氯过苯甲酸(m-CPBA)在氯仿中对1,3-双嘧菌酮1a进行Baeyer-Villiger氧化,反应迅速,得到普通的内酯10-氧杂戊酸-clo [5.4.0.0 2.5 .0 3.9。 0 4.8 ] undecan-11-one 2a和骨架重排产物11-oxapentacy-clo [6.3.0.0 2.4 .0 3.7 .0 5.9 ] undecan -10-one 4a。1a的甲基取代的同系物(1d,1e,1f)得到相应的普通内酯和重排内酯(2d,2e,2f,4d,4e,4f)。在这些氧化中,通过碳阳离子,环丁基的机理18和环丙基羰基阳离子19的主要作用与普通协同迁移机制不同。溶剂效应,动力学处理和甲基取代基对产物比率的影响支持了这种碳正离子化机理。酮与m-CPBA之间的加合物形成过程必须是速率决定的。