The present invention relates to a process for the enantioselective enzymatic aminolysis of racemic 2-[3-(4-cyanophenyl)-4,5-dihydro-5-isoxazolyl]acetate ((R/S)-I) by methyl N.sub..alpha. -Boc-L-.alpha.,.beta.-diaminoproprionate.p-toluenesulfonic acid. More specifically, this invention pertains to a process for the enantioselective enzymatic aminolysis of racemic isobutyl 2-[3-(4-cyanophenyl)-4,5-dihydro-5-isoxazolyl]-acetate by methyl N.sub..alpha. -Boc-L-.alpha.,.beta.-diaminoproprionate.p-toluene sulfonic acid to produce (R)-methyl-3-[[[3-(4-cyanophenyl)-4,5-dihydro-5-isoxazolyl]acetyl]amino]-N -(butoxycarbonyl)-L-alanine, an intermediate in the preparation of roxifiban, an isoxazoline-based platelet glycoprotein IIb/IIIa antagonist which has activity as an antithrombotic agent.

La présente invention concerne un processus pour l'aminolysis enzymatique enantioselective de 2-[3-(4-cyanophenyl)-4,5-dihydro-5-isoxazolyl]acetate racémique ((R/S)-I) par N.sub..alpha méthylique. - Boc-L-.alpha., acide de.beta.-diaminoproprionate.p-toluenesulfonic. Plus spécifiquement, cette invention concerne un processus pour l'aminolysis enzymatique enantioselective de 2-[3-(4-cyanophenyl)-4,5-dihydro-5-isoxazolyl]-acetate isobutylique racémique par N.sub..alpha méthylique. - Boc-L-.alpha., acide sulfonique de.beta.-diaminoproprionate.p-toluene à produire (R)-methyl-3-[[[3-(4-cyanophenyl)-4,5-dihydro-5-isoxazolyl]acetyl]amino]-N (butoxycarbonyl)-L-alanine, une intermédiaire dans la préparation de roxifiban, un antagoniste isoxazoline-basé de la glycoprotéine IIb/IIIa de plaquette qui a l'activité comme agent antithrombique.

 
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