Photochemical Reaction of N,N-Dimethyl-4-chloroaniline with Dienes: New Synthetic Paths via a Phenyl Cation
作者:Benedetta Guizzardi、Mariella Mella、Maurizio Fagnoni、Angelo Albini
DOI:10.1002/chem.200390178
日期:2003.4.4
CF(3)CH(2)OH. In the latter solvent, formation of ethers from open-chain alkenes is accompanied by Wagner-Meerwein hydride shift. In acetonitrile, the cation from cyclooctadiene partitions between deprotonation and Ritter addition, while the one from norbornadiene is reduced; both cations undergo nucleophilic addition in trifluoroethanol. The relevance of these cationic reactions under unusually mild conditions
在乙腈中存在开链二烯的情况下,对N,N-二甲基-4-氯苯胺进行辐照会导致在两个双键之一之间加成氨基苯基和氯基。环二烯发生跨环环化反应,从降冰片二烯生成芳基降三环烯,从1,5-环辛二烯生成1-芳基双环[3.3.0]辛烷。反应通过氯苯胺的光杂解进行,得到4-氨基苯基阳离子,并加到CdoublebondC上。加合物阳离子的化学性质取决于结构和介质,包括MeCN中的离子对和CF(3)CH(2)OH中的溶剂化离子。在后一种溶剂中,由开链烯烃形成的醚伴随着Wagner-Meerwein氢化物转移。在乙腈中,环辛二烯的阳离子在质子化和Ritter加成之间分配,而降冰片二烯中的一种被减少;两个阳离子都在三氟乙醇中进行亲核加成。讨论了这些阳离子反应在异常温和条件下的相关性。