The invention relates to improved process for the preparation of fesoterodine and its pharmaceutically acceptable salt, specifically fesoterodine fumarate of formula (1). The invention relates to solid state forms of a novel salt of fesoterodine and process for the preparation thereof. The invention also relates to highly pure fesoterodine fumarate substantially free of impurity X at RRT 1.37. The invention also provides solid particles of pure fesoterodine fumarate wherein 90 volume-percent of the particles (D90) have a size of higher than 200 microns.
该发明涉及一种改进的制备费索罗丁及其药学上可接受的盐(具体为公式(1)的
富马酸盐)的方法。该发明涉及费索罗丁的新盐的固态形式及其制备方法。该发明还涉及高纯度费索罗丁
富马酸盐,其杂质X在RRT 1.37处几乎不含。该发明还提供了纯度高的费索罗丁
富马酸盐的固体颗粒,其中90体积百分比的颗粒(D90)具有大于200微米的尺寸。