Provided is a method of preparing an optically pure compound having formula 1 or its salts. The method includes: reacting (R)-2-(4-methoxy-3-aminosulfonyl-phenyl)-1-methylethylamine or its salts with a compound selected from the group consisting of chloroacetic acid, bromoacetic acid, fluoroacetic acid, iodoacetic acid, α-halogenoacetic acid anhydride, and α-halogenoacetyl halide in the presence of a base or an acylating agent.
提供了一种制备具有公式1或其盐的光学纯化合物的方法。该方法包括:在碱或酰化剂的存在下,将(R)-2-(4-甲氧基-3-
氨基磺酰基苯基)-1-
甲基乙基胺或其盐与选择自
氯乙酸、
溴乙酸、
氟乙酸、
碘乙酸、α-卤代
乙酸酐和α-卤代乙
酰卤反应。