A process for the preparation of (2R)-methyl-4,4,4-trifluorobutylamine, or an acid addition salt thereof which comprises a) acylating an optically active amine with 2-methyl-4,4,4-trifluorobutanoic acid or a reactive derivative thereof to afford a butyramide; b) separating (R)-diastereomeric butyramide from (S)-diastereomeric butyramide; and c) converting the (R)-diastereomeric butyramide into the desired (2R)-methyl-4,4,4-trifluorobutylamine, or an acid addition salt thereof. The product may be acylated with a carboxylic acid of formula III ##STR1## wherein U is carboxy, or a reactive derivative thereof to afford (R)-4-[5-(N-[4,4,4-trifluoro-2-methylbutyl]carbamoyl)-1-methylindol-3-yl-m ethyl]-3-methoxy-N-o-tolylsulphonylbenzamide. The indole is useful as a leukotriene antagonist, for example in the treatment of asthma or allergic rhinitis.
                            制备(2R)-甲基-4,4,4-三
氟丁基胺或其酸加成盐的过程包括:a)用
2-甲基-4,4,4-三氟丁酸或其反应衍
生物酰化手性胺以得到丁酰胺;b)将(R)-对映异构体丁酰胺与(S)-对映异构体丁酰胺分离;c)将(R)-对映异构体丁酰胺转化为所需的(2R)-甲基-4,4,4-三
氟丁基胺或其酸加成盐。该产品可与公式III的
羧酸进行酰化反应,其中U是羧基或其反应衍
生物,以得到(R)-4-[5-(N-[4,4,4-三
氟-2-甲基丁基]
氨基甲酰)-
1-甲基吲哚-3-基甲基]-3-甲氧基-N-邻
甲苯磺酰苯甲酰胺。该
吲哚化合物可用作
白三烯拮抗剂,例如用于治疗哮喘或过敏性鼻炎。