The invention relates to a process for the preparation of lifitegrast (I) comprising a) reacting benzofuran-6-carboxylic acid (II) with a non- chlorinated carboxyl activating agent; and b) reacting the activated compound obtained in step a) with compound (III) or a salt thereof to give lifitegrast. It also relates to a process for the purification of lifitegrast (I) by i) reacting lifitegrast with dicyclohexylamine to give the dicyclohexylamine salt of lifitegrast (la); ii) isolating the salt from the reaction medium; iii) converting the isolated salt into lifitegrast by treatment with an acid; and iv) isolating lifitegrast from the reaction medium. It also relates to the dicyclohexylamine salt of lifitegrast (la) and to a process for its preparation. (Formula I, III)
该发明涉及一种制备利非替格雷斯特(I)的方法,包括a)将
苯并呋喃-6-羧酸(II)与非
氯化羧基活化剂反应;和b)将步骤a)获得的活化化合物与化合物(III)或其盐反应以得到利非替格雷斯特。还涉及一种通过i)将利非替格雷斯特与
二环己胺反应以得到利非替格雷斯特的
二环己胺盐(la);ii)从反应介质中分离盐;iii)通过用酸处理分离的盐将其转化为利非替格雷斯特;和iv)从反应介质中分离利非替格雷斯特的利非替格雷斯特纯化方法。还涉及利非替格雷斯特的
二环己胺盐(la)及其制备方法。