A process for preparing (r)-4-cyano-3-hydroxybutyric acid ester

Details A process for preparing (r)-4-cyano-3-hydroxybutyric acid ester A process for preparing (r)-4-cyano-3-hydroxybutyric acid ester

C - Chemistry, Metallurgy

07

C

C07C 255/20 (2006.01) C07C 253/00 (2006.01)

Patent

CA 2361680

The present invention relates to a process for preparing (R)-4-cyano-3- hydroxybutyric acid ester derivatives and more particularly, to a process for preparing optically pure (R)-4-cyano-3-hydroxybutyric acid ester derivatives expressed by formula (1) in high yield by performing cyanation and sequential esterification of (S)-3,4-epoxybutyric acid salt as a starting material. In said formula, R represents linear or branched alkyl group with 1~5 carbon atoms or benzyl group.

L'invention concerne un procédé de préparation de dérivés d'ester d'acide (R)-4-cyano-3-hydroxybutyrique et plus particulièrement un procédé pour préparer des dérivés d'ester d'acide (R)-4-cyano-3-hydroxybutyrique optiquement purs, exprimés par la formule (1), avec un rendement élevé et par cyanation et estérification séquentielle du sel d'acide (S)-3,4-epoxybutyrique utilisé comme substance de départ. Dans ladite formule, R représente un groupe alkyle linéaire ou ramifié avec 1 à 5 atomes de carbone ou un groupe benzyle.

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