Process for isolation of 1-[N2-((S-Ethoxycarbonyl)-3-phenylpropyl)-N6-trifluoroacetyl]-L-lysyl-L-proline (Lisinopril (Tfa) ethylester, LPE)

摘要

Isolation of 1-ÄN<2>-((S)-ethoxycarbonyl)-3-phenylpropyl)-N<6>-trifluoroacetylÜ-L- lysyl-L-proline (I) (i.e. lisinoprilÄTFAÜ ethyl ester) from an aqueous solution obtained in the production of (I), comprises extraction followed by crystallisation. The novelty is that the solvent (or solvent mixture) used for extraction of (I) is also a major component of the solvent (mixture) used for crystallisation of (I). Also claimed is (I) which exhibits reflections at 6.7241, 9.4851, 11.9034, 16.3074 and 17.8722 (2&thetas; ).