[EN] BENZIMIDAZOLE SUBSTITUTION-BASED PHENYL N-BUTYRAMIDE COMPOUND AND PREPARATION METHOD THEREFOR<br/>[FR] COMPOSÉ DE PHÉNYL N-BUTYRAMIDE BASÉ SUR LA SUBSTITUTION DE BENZIMIDAZOLE ET SON PROCÉDÉ DE PRÉPARATION<br/>[ZH] 基于苯并咪唑取代的苯基正丁酰胺的化合物及其制备方法
An efficient synthesis has been developed for telmisartan. The key strategy is the construction of substituted bis-benzimidazole 11b by oxidativecyclization of substituted amidine 15 with bis(trifluoroacetoxy)iodobenzene. In this research, we provided telmisartan from the starting compound 12 in an overall yield of 61.5% by four steps while avoiding many issues previously reported.