Photochemical Reactivity of 1-Substituted-1-aza-1,4-dienes Promoted by Electron-Acceptor Sensitizers. Di-π-methane Rearrangements and Alternative Reactions via Radical-Cation Intermediates
作者:Diego Armesto、Maria J. Ortiz、Antonia R. Agarrabeitia、Santiago Aparicio-Lara、Mar Martin-Fontecha、Marta Liras、M. Paz Martinez-Alcazar
DOI:10.1021/jo026440l
日期:2002.12.1
series of beta,gamma-unsaturated imines, oxime acetates, and oxime methyl ethers, using 9,10-dicyanoanthrathene (DCA) or dicyanodurene (DCD) as electron acceptor sensitizers, affords the corresponding cyclopropanes resulting from 1-aza-di-pi-methane rearrangements via radical cations. In some cases, alternative reactions of these intermediates occur to yield nitriles, dihydroquinolines, dihydronaphthalene
使用9,10-二氰基蒽(DCA)或二氰基二氢呋喃(DCD)作为电子受体敏化剂,辐照一系列β,γ-不饱和亚胺,肟肟和肟甲基醚,得到相应的由1-氮杂-二氮杂生成的环丙烷-π-甲烷通过自由基阳离子重排。在某些情况下,这些中间体会发生交替反应,从而生成腈,二氢喹啉,二氢萘衍生物和环加成产物。这些产物中的一些是通过烯烃自由基阳离子中间体的反应产生的,而其他产物是通过涉及亚胺自由基阳离子中间体的途径产生的。当DCD代替DCA用作电子受体敏化剂时,在这些过程中形成的产物的产率明显更高。