The present invention describes the improved process for the preparation of montelukast acid (VII) and its pharmaceutically acceptable salts and esters using a novel synthesis step. The process is cost effective, environment friendly, and easily scale up to commercial level and leads to products having high chemical and optical purity. Moreover, the present invention provides a novel crystalline intermediate (IV) that is useful in this process and a method for its production. In a further aspect, the process of the present invention includes a step of removing ketone by-products be derivatization.
本发明描述了一种改进的蒙特卢卡斯酸(VII)及其药用可接受盐和酯的制备过程,使用了一种新型合成步骤。该过程具有成本效益、环保且易于扩大至商业
水平,并导致具有高
化学和光学纯度的产品。此外,本发明提供了一种在该过程中有用的新型结晶中间体(IV)及其生产方法。进一步地,本发明的过程包括通过衍生化去除酮副产物的步骤。