Polysubstiluted o-phenylenediamines were syathesised in moderate to high yield by reductive cleavage of the corresponding 2H-benzimidazole-2-spirocyclohexane with sodium dithionite in aqueous ethanol and converted into methyl benzimidazole-2-carbamates and 2-methylthio-and 2-trifluoromethylbenzimidazoles with known or potential anthelminthic activity. 5-(Pyrimidin-2-ylthio)-benzimidazole and 1 l-(
通过用
连二亚硫酸钠在
乙醇水溶液中还原裂解相应的2 H-
苯并咪唑-2-螺
环己烷,可以中等至高收率合成多取代的
邻苯二胺,然后将其转化为甲基
苯并咪唑-2-
氨基甲酸酯和2-甲
硫基和2-三
氟甲基
苯并咪唑已知或潜在的驱虫活性。还合成了5-(
嘧啶-2-基
硫基)-
苯并咪唑和1l-(
吡啶-2-基
硫基)二烯并[ a,c ]
吩嗪。将2,3-二
氨基
喹喔啉与
环己酮缩合制备的1,3-二氢-2 H -4,9-二氮杂[2,3- d ]
咪唑的尝试氧化为标题体系的类似物失败。