[EN] A NOVEL PROCESS FOR SYNTHESIS OF PREGABALIN FROM SUBSTITUTED CYCLOPROPANE INTERMEDIATE AND A PROCESS FOR ENZYMATIC RESOLUTION OF RACEMIC PREGABALIN<br/>[FR] NOUVEAU PROCÉDÉ DE SYNTHÈSE DE LA PRÉGABALINE À PARTIR D'UN INTERMÉDIAIRE CYCLOPROPANE SUBSTITUÉ ET PROCÉDÉ POUR LA RÉSOLUTION ENZYMATIQUE DE LA PRÉGABALINE RACÉMIQUE
申请人:VB MEDICARE PVT LTD
公开号:WO2009087650A2
公开(公告)日:2009-07-16
A novel process of preparation of racemic pregabalin from comprising an intermediate of structure III comprising reductive ring opening to form a structure IV followed few alternative routes that yield racemic pregabalin that is resolved to yield (S) + pregabalin by using chemical or enzymatic methods. A new chemical entity of structure IIIc is also disclosed as a novel intermediate. A part of the novel process also comprises a new process of producing a compound of structure VII comprising acylation of compound of structure V followed by elimination and improving a process of producing a compound of structure VII comprising reacting isovaleraldehyde with nitromethane through the compounds 4-methyl-1-nitropentan- 2-ol, 3-methyl-1-(nitromethyl)butylacetate, and 3-methyl-1-(nitromethyl)butyl acetate under suitable conditions to 4-methyl-1-nitropet-1-ene. Enzymatic processes of resolution of racemic pregabalin esters into (S) pregabalin and (R) pregabalin are also disclosed.