Studies on sulfenamides. VIII. Anodic oxidation of 2-nitrobenzenesulfenamides derived from secondary cyclic amines.
作者:HIROTERU SAYO、YASUSHI YAMADA、TAKASHI MICHIDA
DOI:10.1248/cpb.31.4530
日期:——
Methyl 2-nitrobenzenesulfenate (5) was formed by controlled potential electrolysis (CPE) of N-(2-nitrophenylthio) amines (morpholine (1), piperidine (2), pyrrolidine (3), thiomorpholine (tetrahydro-4H-1, 4-thiazine) (4)) in methanol at a glassy carbon anode. A yellow powder obtained by the electrolysis of 1 reacted with triethylamine to give 2, 4-bis (o-nitrophenylthio)-5, 6-dihydro-1, 4-oxazine (7). CPE of 1-4 in acetonitrile gave 2, 2'-dinitrodiphenyldisulfide (6). These results suggest that the initial step of anodic oxidation of 1-4 in acetonitrile is an EC process (an electron transfer process followed by a chemical reaction), while that in methanol is an ECE process (an electron transfer process followed by a chemical reaction and then an electron transfer process). Enamine is considered to be one of the intermediates in the anodic oxidation of 1-4 in methanol.
通过在玻璃碳阳极上对甲醇中的 N-(2-硝基苯硫基)胺(吗啉(1)、哌啶(2)、吡咯烷(3)、硫代吗啉(四氢-4H-1,4-噻嗪)(4))进行受控电位电解(CPE),生成了 2-硝基苯硫酸甲酯(5)。电解 1 得到的黄色粉末与三乙胺反应生成 2,4-双(邻硝基苯硫基)-5,6-二氢-1,4-恶嗪(7)。在乙腈中对 1-4 进行 CPE 反应,得到 2,2'-二硝基二苯二硫醚(6)。这些结果表明,1-4 在乙腈中阳极氧化的第一步是 EC 过程(先发生电子转移过程,然后发生化学反应),而在甲醇中则是 ECE 过程(先发生电子转移过程,然后发生化学反应,最后发生电子转移过程)。烯胺被认为是 1-4 在甲醇中阳极氧化的中间产物之一。