Studies on sulfenamides. XII Anodic oxidation of N-(o-nitrophenylthio)-1,2,3,4-tetrahydroquinoline and N-(o-nitrophenylthio)-1,2,3,4-tetrahydroisoquinoline.
作者:HIROTERU SAYO、HIROMI HATSUMURA、TAKASHI MICHIDA
DOI:10.1248/cpb.34.4139
日期:——
The paramagnetic species formed by anodic oxidation of N-(o-nitrophenylthio)-1, 2, 3, 4-tetrahydroquinoline (3) in acetonitrile has been identified as the radical cation of 1, 1', 2, 2', 3, 3', 4, 4'-octahydro-1, 1'-di-(o-nitrophenylthio)-6, 6'-biquinoline by isolating the radical cation perchlorate. The perchlorate separated out from the electrolyzed solution and its structure was confirmed by converting it to 1, 1', 2, 2', 3, 3', 4, 4'-octahydro-6, 6'-biquinoline. Anodic oxidation of N-(o-nitrophenylthio)-1, 2, 3, 4-tetrahydroisoquinoline (4) in methanol gave an almost quantitative yield of 3, 4-dihydroisoquinoline (7) and a 56% yield of methyl 2-nitrobenzenesulfenate (9). In acetonitrile, electrolysis of 4 gave a 33% yield of 7 and no 9. These results were interpreted in terms of a much faster rate of deprotonation of the sulfenamide radical cation in methanol than in acetonitrile.
通过分离 N-(邻硝基苯硫基)-1,2,3,4-四氢喹啉 (3) 在乙腈中阳极氧化形成的顺磁物种,确定其为 1,1',2',2',3',3',4,4'-八氢-1,1'-二(邻硝基苯硫基)-6,6'-喹啉的自由基阳离子高氯酸盐。高氯酸盐从电解溶液中分离出来,并通过转化为 1, 1', 2, 2', 3, 3', 4, 4'-octahydro-6, 6'-biquinoline 确认了其结构。在甲醇中对 N-(邻硝基苯硫基)-1,2,3,4-四氢异喹啉(4)进行阳极氧化,几乎定量地得到了 3,4-二氢异喹啉(7),并得到了 56%的 2-硝基苯硫酸甲酯(9)。在乙腈中,电解 4 得到 33% 的 7,没有 9。对这些结果的解释是,磺酰胺基阳离子在甲醇中的去质子化速度比在乙腈中快很多。