名称:
4-substituted 2-chloromethyl[1,2,4]triazolo[1,5-a]benzimidazoles and their transformations
摘要:
2,4-Dimethyl[1,2,4]triazolo[1,5-a]benzimidazole reacted with bromine to give 7-bromo derivative through the corresponding stable perbromide. Cyclization of quaternary 1,2-diamino-3-R-benzimidazolium salts with chloroacetyl chloride in boiling xylene afforded 2-chloromethyl-4-R-[1,2,4]triazolo[1,5-a]benzimidazoles [R = Me, ArOCH2CH2, ArC(O)CH2] which readily underwent exchange reactions with nitrogen-, oxygen-, and sulfur-centered nucleophiles and Wittig reaction with formation of 2-vinyl derivatives.