[EN] PROCESS FOR THE PREPARATION OF ( S ) - 3 - CYANO - 5 - METHYLHEXANOIC ACID DERIVATIVES ADN OF PREGABALIN [FR] PROCÉDÉ DE PRÉPARATION DE DÉRIVÉS D'ACIDE (S)-3-CYANO-5-MÉTHYLHEXANOÏQUE ET DE PRÉGABALINE
[EN] PROCESS FOR THE PREPARATION OF ( S ) - 3 - CYANO - 5 - METHYLHEXANOIC ACID DERIVATIVES ADN OF PREGABALIN [FR] PROCÉDÉ DE PRÉPARATION DE DÉRIVÉS D'ACIDE (S)-3-CYANO-5-MÉTHYLHEXANOÏQUE ET DE PRÉGABALINE
This publication describes the evaluation of four synthetic routes to the advanced pregabalin (Lyrica) intermediate 7. Asymmetric reduction of (E)-7 with an ene-reductase (OPR1 from Lycopersicon esculentum) gave a saturated cyanoester intermediate 5 with the desired S stereocenter in >99% ee. OPR1 also catalyzed the reduction of (Z)-7 to (S)-5, but with lower conversion and selectivity.