Continuous process for preparing optically pure...

C - Chemistry – Metallurgy – 12 – P

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C12P 41/00 (2006.01) C07C 51/00 (2006.01) C07D 307/33 (2006.01) C12P 7/42 (2006.01) C12P 17/04 (2006.01) C12P 19/14 (2006.01) C12P 19/22 (2006.01)

Patent

CA 2338756

The present invention relates to a continuous process for preparing optically pure (S)-3-hydroxy-.gamma.-butyrolactone expressed by formula (1) and more particularly, to a process which enables preparing optically pure (S)-3- hydroxy-.gamma.-butyrolactone economically in large quantities, by: (a) preparing .alpha.-(1,4) linked oligosaccharide with adequate sugar distribution by reacting amylopectin which is easily available from natural product with enzyme under a specific condition; and (b) performing oxidation, esterification and cyclization sequentially under a specific condition.

Cette invention, qui a trait à un procédé en continu de préparation de la (S)-3-hydroxy-.gamma.-butyrolactone optiquement pure correspondant à la formule 1, concerne, plus précisément, un procédé permettant de préparer de la (S)-3-hydroxy-.gamma.-butyrolactone optiquement pure, de façon économique et en grande quantité. Ce procédé consiste à (a) préparer une oligosaccharide liée .alpha.-(1,4) à distribution de sucre appropriée par réaction d'amylopectine aisément disponible à partir du produit naturel avec une enzyme dans des conditions spécifiques et, (b), à procéder à une oxydation, à une estérification et à une cyclisation, de manière séquentielle, dans des conditions spécifiques.

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