The present invention relates to a novel process for the preparation of montelukast sodium, a compound of Formula (1b) and precursors thereof. The invention further concerns the free acid of this compound in crystalline form, obtainable for the first time by the new process.
本发明涉及一种制备蒙特卢卡斯
钠的新工艺,该化合物为公式(1b)及其前体化合物。本发明还涉及该化合物的晶体形式的自由酸,首次通过新工艺获得。