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A PROCESS FOR THE PREPARATION OF (2R)-METHYL-4,4,4- -TRIFLUOROBUTYLAMINE, OR AN ACID ADDITION SALT THEREOF, AND INTERMEDIATES OF THIS PROCESS
A PROCESS FOR THE PREPARATION OF (2R)-METHYL-4,4,4- -TRIFLUOROBUTYLAMINE, OR AN ACID ADDITION SALT THEREOF, AND INTERMEDIATES OF THIS PROCESS
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机译:(2R)-甲基-4,4,4-三氟甲基丁酰胺或其酸加成盐的制备方法,以及该方法的中间体
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摘要
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 acylating with a carboxylic acid of formula (III) 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-methyl]-3-methoxy-N-o-tolylsulphonylbenzamide. The indole is useful as a leukotriene antagonist, for example in the treatment of asthma or allergic rhinitis.
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