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。
2H-benzimidazoles (isobenzimidazoles). Part 6. Sulfur derivatives
摘要:
The products obtained by treating 2H-benzimidazole-2-spirocyclohexane 1 or its 5-chloro derivative 9 with various thiols (PrSNa, Bu(t)SNa, PhSNa, pyridine-2-thiol, or pyrimidine-2-thiol) depend on the reaction conditions. Monosubstitution is possible and any number of alkylthio groups can be introduced up to four.5-Phenylsulfonyl- 18 and 5-nitro-2H-benzimidazole-2-spirocyclohexane 10 react with pyridine-2-thiol or pyrimidine-2-thiol in position-4 whilst the 5-(pyridin-2-ylthio) derivative 16 reacts with sodium benzenesulfinate in position-6. In all cases the products isolated were the 1,3-dihydro compounds 26, 38, 39 or 21, respectively.