Electrochemical N-arylation of azoles in MeOH using undivided electrolysis of their mixtures with 1,4-dimethoxybenzene
作者:V. A. Petrosyan、A. V. Burasov、T. S. Vakhotina
DOI:10.1007/s11172-005-0380-7
日期:2005.5
The reactions of 1,4-dimethoxybenzene with azoles (pyrazole, triazole, and their derivatives, as well as tetrazole) were studied by undivided amperostatic electrolysis at Pt electrodes in MeOH. The process proceeds via the formation of a 1,1,4-trimethoxyarenonium cation as the key intermediate and affords 1,1,4,4-tetramethoxycyclohexa-2,5-diene, 1,1,4-trimethoxy-4-(azol-1-yl)cyclohexa-2,5-diene, and 1,4-dimethoxy-2-(azol-1-yl)benzene as the main products. Azole and solvent molecules compete as nucleophiles during electrolysis. A fine mechanism of the process was considered.
在 MeOH 中,通过在铂电极上进行不分裂的安培静态电解,研究了 1,4 二甲基苯与偶氮唑(吡唑、三唑及其衍生物以及四唑)的反应。该过程以 1,1,4- 三甲氧基壬鎓阳离子的形成为关键中间体,主要产物为 1,1,4,4- 四甲氧基环己-2,5-二烯、1,1,4-三甲氧基-4-(偶氮唑-1-基)环己-2,5-二烯和 1,4- 二甲氧基-2-(偶氮唑-1-基)苯。在电解过程中,偶氮唑和溶剂分子作为亲核体进行竞争。研究考虑了这一过程的精细机制。