An efficient method for the synthesis of 1-chlorophenazines based on the selective cathodic reduction of 3,3,6,6-tetrachloro-1,2-cyclohexanedione
作者:Antonio Guirado、Alfredo Cerezo、Raquel Andreu、José I. López Sánchez、Delia Bautista
DOI:10.1016/j.tet.2004.06.089
日期:2004.8
An efficient method for the synthesis of 1-chlorophenazines has been established. It is based on the use of 3,6,6-trichloro-2-hydroxy-2-cyclohexen-1-one 4 as a synthetic equivalent of 3-chloro-1,2-benzoquinone 3. The intermediate 4 was prepared in near quantitative yield by electroreductive monodechlorination of 3,3,6,6-tetrachloro-1,2-cyclohexanedione 1, which is an inexpensive and easily available
已经建立了合成1-氯吩嗪的有效方法。它基于使用3,6,6-三氯-2-羟基-2-环己烯-1-酮4作为3-氯-1,2-苯醌3的合成等价物。通过对3,3,6,6-四氯-1,2-环己二酮1进行电还原单氯化,以接近定量的收率制备中间体4,这是一种廉价且易于获得的原料。4与伯1,2-苯二胺的有效反应提供了相应的1,1,4-三氯-1,2,3,4-四氢吩嗪6通过用2,6-二甲基吡啶处理直接将其芳香化,从而以高收率得到标题化合物。1,1,4-三氯-1,2,3,4-四氢-6-甲基吩嗪6f,8-苯甲酰基-1,1,4-三氯-1,2,3,4-四氢的X射线晶体学结构已确定了-phenazine 6ea和1,7-dichlorophenazine 10db。