The invention provides a novel chemical process for the manufacture of certain imidazo[4,5-b]pyridine derivatives of the formula I wherein R1, R2, R3 and R4 have the various meanings defined herein, and their non-toxic salts, which are angiotensin II inhibitors. The process involves the removal of an electron-deficient phenyl group or a pyridyl or pyrimidyl group from a compound of the formula II as defined herein. Certain of the intermediates are novel and are provided as a further feature of the invention.
本发明提供了一种新型
化学工艺,用于制造某些式 I 的
咪唑并[4,5-b]
吡啶衍生物(其中 R1、R2、R3 和 R4 具有本文所定义的各种含义)及其无毒盐,它们是
血管紧张素 II
抑制剂。该工艺涉及从本文定义的式 II 化合物中去除缺电子的苯基或
吡啶基或
嘧啶基。某些中间体是新颖的,作为本发明的另一特征提供。