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.