The invention relates to a process for the preparation of Lifitegrast of formula (I), which comprises: a) condensation of the compound of formula (II) with the compound of formula (III) to give the compound of formula (IV) wherein R1, R2 and R3 are independently selected from straight or branched C1- C6 alkyl groups; b) chlorination of compound (IV) in the presence of a chlorinating agent (IV), (V), c) condensation of compound (V) with amino acid (VI) to give compound (I), c) condensation of compound (V) with amino acid (VI) to give compound (I), d) optional purification of the crude Lifitegrast in mixtures of polar aprotic solvents and water.
本发明涉及一种制备式(I)的利福替格拉斯特的方法,其包括:a)将式(II)的化合物与式(III)的化合物缩合,以得到式(IV)的化合物,其中R1、R2和R3独立地选择直链或支链C1-C6烷基基团;b)在
氯化剂(IV),(V)的存在下
氯化化合物(IV),c)将化合物(V)与
氨基酸(VI)缩合,以得到化合物(I),d)可选地在极性非质子溶剂和
水的混合物中纯化粗利福替格拉斯特。