Photo-Induced Reactions of Oxime O-Ethers Derived from 3-Acyl-1,2-dihydrocinnoline-1,2-dicarboximides
作者:Satoko Tanaka、Kazuyoshi Seguchi、Kuniaki Itoh、Akira Sera
DOI:10.1246/bcsj.69.3533
日期:1996.12
The irradiation of oxime O-ethers 2, derived from N-substituted 3-acyl-1,2-dihydrocinnoline-1,2-dicarboximides in benzene, afforded rearranged products 3 possessing a [1,3,5]triazino[1,2-a]indole skeleton in good yields. Upon irradiation, 7-methoxy-substituted 1,2-dihydrocinnoline-1,2-dicarboximides 2 gave a novel dimer 5 together with the rearranged triazinoindole derivatives 3 in benzene, while in nucleophiles they gave the nucleophile-incorporated dihydrotriazinoindoles 6. However, the 7-nitro-substituted one was inert under the same conditions. The dimer and dihydrotriazinoindole derivatives were thought to be formed by a nucleophilic attack of the initial photoproduct 3 and nucleophiles to 2, respectively. From these results and the observation of a remarkable solvent-dependency of the fluorescence and UV spectra of 2, it was suggested that these photoreactions should occur through a nitrogen–nitrogen bond cleavage at polar excited states followed by skeletal rearrangements.
衍生自苯中的 N-取代 3-酰基-1,2-二氢肉啉-1,2-二甲酰亚胺的肟 O-醚 2 的辐射,得到具有 [1,3,5]三嗪基[1,2] 的重排产物 3 -a]吲哚骨架,收率良好。辐射后,7-甲氧基取代的 1,2-二氢肉啉-1,2-二甲酰亚胺 2 与苯中重排的三嗪吲哚衍生物 3 一起生成新型二聚体 5,而在亲核试剂中,它们生成亲核试剂掺入的二氢三嗪吲哚 6。 7-硝基取代的化合物在相同条件下呈惰性。二聚体和二氢三嗪吲哚衍生物被认为是分别通过初始光产物3和亲核试剂对2的亲核攻击而形成的。从这些结果以及对 2 的荧光和紫外光谱的显着溶剂依赖性的观察来看,表明这些光反应应该通过极性激发态下的氮-氮键断裂以及随后的骨架重排来发生。