作者:Jianhong Zhao、Yicheng Xiong、Wu-Lin Yang、Fan Yang、Yu Jin
DOI:10.1021/acs.oprd.1c00025
日期:2021.4.16
We reported herein an efficient and practical method to access 1,7′-dimethyl-2′-propyl-2,5′-bi(1H-benzimidazole) 1, a key intermediate for the synthesis of telmisartan. The synthetic route was based on readily available o-methylaniline as the starting material, and the target product 1 was prepared through a six-step process, including amidation, formylation, cyclization, hydrolysis, amidine, and oxidation
我们在本文中报道了一种有效而实用的方法,可访问1,7'-二甲基-2'-丙基-2,5'-双(1 H-苯并咪唑)1,这是替米沙坦合成的关键中间体。合成途径基于容易获得的邻甲基苯胺作为起始原料,并且通过六步法制备目标产物1,包括酰胺化,甲酰化,环化,水解,am和氧化。制备1的总产率以100g规模为51.5%,纯度为99.91%。该方法的显着特征包括经济且容易获得的起始原料,操作简便和环境友好,这适合于工业生产。