Redox-Photosensitized Aminations of 1,2-Benzo-1,3-cycloalkadienes, Arylcyclopropanes, and Quadricyclane with Ammonia
作者:Masahide Yasuda、Ryuji Kojima、Hiroshi Tsutsui、Daigo Utsunomiya、Kazuaki Ishii、Koutaro Jinnouchi、Tsutomu Shiragami、Toshiaki Yamashita
DOI:10.1021/jo030053+
日期:2003.10.1
the cation radicals of the sensitizers that were generated by photoinduced electron transfer to the electron acceptors to the substrates. Therefore, it was found that the relationships in oxidation potentials between the sensitizers and the substrates and the positive charge distribution of the cation radicals of the substrates were important factors for the efficient amination.
1,2,4-三苯苯和2,2'-亚甲基二氧基-1,1'-联萘在存在下用氨和伯胺成功地光敏化1,2-苯并-1,3-环链二烯,芳基环丙烷和四环烷的胺化间-或对-二氰基苯,得到4-氨基-1,2-苯并环烯烃,3-氨基-1-芳基丙烷和7-氨基-5-(对氰基苯基)双环[2.2.1] hept-2 -ene。光敏胺化的关键途径是空穴从敏化剂的阳离子自由基的转移,该阳离子自由基是由光诱导的电子转移到电子受体转移到基体而产生的。因此,发现敏化剂与基材之间的氧化电势与基材的阳离子自由基的正电荷分布之间的关系是有效胺化的重要因素。