Method for synthesis of perindopril and its pharmaceutically acceptable salts

摘要

Production of perindopril (I) comprises: (1) reacting (S)-2-bromo-phenylalanine (II) with (R)-2-substituted propionyl chloride (III) to give (IV); (2) subjecting (IV) to intramolecular coupling; (3) reacting the obtained indoline derivative (V) with ethyl (2S)-2-aminopentanoate (VI); and (4) catalytically hydrogenating the obtained 1-(N-substituted alanyl)-hexahydroindole derivative (VII). Production of (2S,3aS,7aS)-1-((2S)-2-((1S)-1-(ethoxycarbonyl)-butylamino)-propionyl)-octahydro-1H-indole-2-carboxylic acid (perindopril) (I) or its salt comprises: (1) reacting optionally protected (S)-2-bromo-phenylalanine of formula (II) with (R)-2-substituted propionyl chloride of formula (III) in presence of base to a compound of formula (IV); (2) subjecting the obtained N-propionylated compound of formula (IV) to intramolecular coupling reaction to give a compound of formula (V); (3) reacting the obtained indoline derivative of formula (V) with ethyl (2S)-2-aminopentanoate (VI) to give a compound of formula (VII); and (4) subjecting the obtained 1-(N-substituted alanyl)-hexahydroindole derivative of formula (VII) to catalytic hydrogenation, optionally followed by deprotection, to give (I). R = H or acid-protecting group; G = Cl, Br, OH, p-toluenesulfonyloxy, methanesulfonyloxy or trifluoromethanesulfonyloxy. An Independent claim is included for the intermediates (IV) as new compounds.