Novel method for preparation of crystalline perindopril erbumine
申请人:Singh Pal Girij
公开号:US20070149604A1
公开(公告)日:2007-06-28
A process for preparation of crystalline perindopril erbumine of formula (II)
which exhibits the X-ray (powder) diffraction pattern like that shown in FIG.
2
The process comprises reacting a solution of perindopril of formula (I),
in a solvent selected from N,N-dimethylformamide, dimethyl acetals of lower aliphatic aldehydes, dimethyl ketals of lower aliphatic ketones and 1,2-dialkoxyethane with tertiary butylamine and crystallization of the erbumine salt thus obtained by heating the reaction mixture to reflux, filtering hot, cooling gradually to 20° C. to 30° C., and further cooling to 0° C. to 15° C. for 30 minutes to 1 hour and finally filtering off and drying the crystals.
A process for preparing perindopril (III) or a pharmaceutically acceptable salt thereof, which process comprises a substituted benzyl ester of (2S,3aS,7aS)-octahydroindole-2-carboxylic acid (I) with N-[(S)-carbethoxybutyl]-(S)-alanine (II) where R represents a halo, C
1-4
alkoxy or nitro substituent.