Frakefamide, an Analgesic Tetrapeptide: Development of a Pilot-Plant-Scale Process
摘要:
A pilot-plant-process is described where frakefamide x HCl (L-tyrosyl-D-alanyl-p-fluoro-L-phenylalanyl-L-phenylalaninamide hydrochloride) was synthesised from its amino acid monomers in seven steps. The synthesis was performed in 70-L equipment, and the final product was obtained in 70% overall yield and in 99.5% purity. Only two intermediates were isolated, and the process required no chromatography. Peptide bond formation was promoted by isobutyl chloroformate-mediated mixed anhydride coupling reactions. The formed mixed anhydrides proved to be surprisingly stable, in most cases for several hours at -10 degreesC, and therefore suitable for large-scale peptide synthesis. Only traces, if any, of racemised coupling products were obtained. Benzyloxycarbonyl was used as amino protecting group throughout the synthesis, and its removal by hydrogenolysis proved to be fast and convenient on a large scale.
[EN] PROCESS FOR THE PREPARATION OF A TETRAPEPTIDE<br/>[FR] PROCEDE DE PREPARATION D'UN TETRAPEPTIDE
申请人:ASTRAZENECA AB
公开号:WO1999047548A1
公开(公告)日:1999-09-23
(EN) The present invention discloses a new and improved process for the preparation of the tetrapeptide H-Tyr-D-Ala-Phe(F)-Phe-NH2 which is a peptide of formula (I) or a pharmaceutically acceptable salt thereof, as well as new intermediates in the preparation thereof. The novel process is suitable for large scale production.(FR) La présente invention concerne un nouveau procédé amélioré de préparation du tétrapeptide H-Tyr-D-Ala-Phe(F)-Phe-NH2 qui est un peptide de la formule (I) ou d'un sel de ce peptide acceptable du point de vue pharmaceutique, ainsi que de nouveaux intermédiaires dans la préparation de ce peptide. Le nouveau procédé selon l'invention convient à une production à grande échelle.