An efficient synthesis of the angiotensin II receptor antagonist Telmisartan (1) is presented involving a cross coupling of 4-formylphenylboronic acid 10 with 2-(2-bromophenyl)-4,4-dimethyl-2-oxazoline (11) as the key step (90% yield). The benzimidazole moiety 15 was constructed regioselectively via a reductive amination-condensation sequence, replacing the alkylation of the preformed benzimidazole step in the previously published route. This methodology overcomes many of drawbacks associated with previously reported syntheses.
本文介绍了一种高效合成
血管紧张素II受体拮抗剂坦索罗尔(
1)的方法,其中关键步骤为4-酰基苯
硼酸10与2-(2-
溴苯基)-4,
4-二甲基-2-
噁唑烷(
11)的交叉偶联(90%收率)。
苯并咪唑基团
15通过还原胺基-缩合序列选择性地构建,代替了先前已发表方法中预形成
苯并咪唑的烷基化步骤。这种方法克服了先前报道的合成方法的许多缺点。