The present invention relates to a process for the preparation of nintedanib or salt thereof. The process comprising reacting compound of formula VI with acetic anhydride and triethyl ortho benzoate to obtain a compound of formula V; further reacting the compound of formula V with the compound of formula IV to obtain nintedanib the compound of formula I. The present invention also relates to a process to obtain crystalline compound of formula V.
本发明涉及一种制备尼特丹尼布或其盐的方法。该方法包括将化合物VI与
乙酸酐和正三乙基邻
苯甲酸酯反应,得到化合物V;进一步将化合物V与化合物IV反应,得到尼特丹尼布的化合物I。本发明还涉及一种获得化合物V结晶的方法。