A study on the scope of the photochemical 1,3-migration of oximino groups in β,γ-unsaturated oximes and oxime derivatives
作者:Diego Armesto、Mar G. Gallego、William M. Horspool、Ana Ramos
DOI:10.1039/p19960000107
日期:——
While the aza-di-π-methane rearrangement is the normal photoreactive behaviour of β,γ-unsaturated imines and oxime acetates, the results obtained in this study show that 1,3-migrations of acetoxyimino groups in β,γ-unsaturated oxime acetates takes place only when all the parameters are correct. The rearrangement takes place when there is a quaternary carbon separating the two π-systems and when one
虽然aza-di-π-甲烷重排是β,γ-不饱和亚胺和肟肟的正常光反应行为,但本研究获得的结果表明,β,γ-不饱和肟乙酸酯中的乙酰氧基亚氨基有1,3-迁移。仅当所有参数正确时才发生。当存在一个将两个π系统分开的季碳原子时,并且当中间环丁基1,4-双自由基中的一个自由基中心通过与苯环的结合而稳定时,就会发生重排。抑制自由转子效应也有助于促进反应。这些标准在化合物1a和7a中得到满足。反应扩展到β,γ-不饱和肟1b和7b,在此又发生肟基的1,3-迁移。