2-Trihalogenomethylbenzazoles. Part IV. Reactions with difunctional nucleophiles. Formation of heterocyclic rings on the 2-position of benzazoles
作者:B. C. Ennis、G. Holan、E. L. Samuel
DOI:10.1039/j39670000033
日期:——
1,4-difunctional nucleophiles. Similarly, aromatic ortho-disubstituted nucleophiles yielded the corresponding azole derivatives. Other heterocyclic rings on the 2-position of benzimidazole were formed in reactions with semicarbazide and mercaptoethanol. The nature and activation of the trihalogenomethyl groups in these cyclisations is discussed, and some reactions of the cyclisation products are also
选定的2-三卤代甲基苯并咪唑与1,2-双官能胺,氨基醇和氨基硫醇的反应形成在2-位被2-咪唑啉-2-基,2-恶唑啉-2-基和2取代的苯并咪唑-噻唑啉-2-基环。通过三卤代甲基与1,3-和1,4-双官能亲核试剂的反应,这种高产率方法扩展到六元和七元环类似物的形成。类似地,芳族邻二取代亲核试剂产生相应的唑衍生物。在苯并咪唑和巯基乙醇的反应中形成了苯并咪唑2位上的其他杂环。讨论了这些环化反应中三卤代甲基的性质和活化,并且还报道了环化产物的一些反应。