A highly efficient approach to the synthesis of Telmisartan is described. Directed ortho-metalation of 4,4-dimethyl-2-phenyl-4,5-dihydrooxazole provided the key organozinc intermediate for a palladium catalysed biaryl coupling with 3′-(4-bromobenzyl)-1,7′-dimethyl-2′-propyl-1H,3′H-2,5′-bibenzo[d]imidazole which was obtained from alkylation of 1,7′-dimethyl-2′-propyl-1H,3′H-2,5′-bibenzo[d]imidazole. This methodology overcomes many of the drawbacks associated with previously reported syntheses.
本文介绍了一种高效合成替米沙坦的方法。4,4-二甲基-2-苯基-4,5-二氢恶唑的定向正金属化为钯催化的 3′-(4-溴苄基)-1.H,3′H-2,5′-二芳基偶联提供了关键的有机锌中间体、7′-二甲基-2′-丙基-1H,3′H-2,5′-联苯并[d]咪唑的烷基化提供了关键的有机锌中间体。这种方法克服了以前报道的合成方法的许多缺点。