2H-benzimidazoles (isobenzimidazoles). Part 10. Synthesis of polysubstituted o-phenylenediamines and their conversion into heterocycles, particularly 2-substituted benzimidazoles with known or potential anthelminthic activity
作者:Justine C. Hazelton、Brian Iddon、Hans Suschitzky、Ley H. Woolley
DOI:10.1016/0040-4020(95)00642-l
日期:1995.9
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。