Continuous process for the production of optically pure...

C - Chemistry – Metallurgy – 07 – D

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C07D 307/20 (2006.01) C07D 307/32 (2006.01)

Patent

CA 2499655

Disclosed is a continuous process for the production of optically pure (S)- .beta.-hydroxy-.gamma.-butyrolactone having constantly maintained optical activity, consisting of hydrogenating 2-50 wt% of a substituted carboxylic acid derivative in a solvent using a fixed bed reactor filled with a precious metal catalyst-impregnated inorganic oxide carrier at 50-500 ~C under pressure of 15-5,500 psig at weight-space-velocity of 0.1-10 h-1, in which a molar ratio of hydrogen to carboxylic acid derivative ranges from 2 to 10. The desired material can be produced in higher optical purity and at higher yield by the current process which is relatively simpler and environmentally safer than conventional processes. Additionally, increased production efficiency leads to production of the desired material on a large scale.

La présente invention a trait à un procédé continu pour la production de (S)-.beta.-hydroxy-.gamma.-butyrolactone présentant une activité optique constamment maintenue, comprenant l'hydrogénation de 2 à 50 % en poids d'un dérivé d'acide carboxylique substitué dans un solvant au moyen d'un lit de réaction fixe rempli d'un support d'oxyde inorganique imprégné de catalyseur à métal noble à une température de 50 500 ·C sous une pression de 15 5,500 psi à une vitesse poids/espace de 0,1 100 h?-1¿, où le rapport molaire d'hydrogène au dérivé de l'acide carboxylique est compris entre 2 et 10. Le matériau souhaité peut être produit avec une pureté supérieure et un rendement plus élevé par le procédé de l'invention qui est relativement plus simple et plus écologique que les procédés classiques. En outre, l'efficacité de production accrue permet une production du matériau désiré sur une grande échelle.

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