Method for the production of optically active cyanohydrins...

C - Chemistry – Metallurgy – 12 – P

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C12P 13/00 (2006.01) C12N 9/88 (2006.01) C12P 41/00 (2006.01)

Patent

CA 2393080

The invention relates to the production of (R)-enantiomeric, optically active cyanohydrins by reacting an aldehyde or a ketone with a cyanide group donor in the presence of (R) oxynitrilase, wherein a reaction mixture comprising a) an aldehyde or a ketone dissolved in an organic solvent; said organic solvent is immiscible or only slightly miscible with water, b) an aqueous R)-oxynitrilase solution and c) a cyanide group donor is stirred in such away that an emulsion is formed which remains intact until the end of the enzymatic reaction. After the enzymatic reaction has terminated, the (R)-cyanohydrin is isolated from the reaction mixture.

La présente invention concerne un procédé permettant la préparation d'énantiomères R de cyanhydrines actives du point de vue optique, par conversion d'un aldéhyde ou d'une cétone avec un donneur de groupes cyanure en présence d'une oxynitrilase R. Dans ledit procédé est réalisé un mélange réactionnel à partir des éléments suivants: a) un aldéhyde ou une cétone dissout(e) dans un diluant organique non miscible ou peu miscible dans l'eau; b) une solution d'oxynitrilase R aqueuse; et c) un donneur de groupes cyanure. Le mélange est réalisé de sorte qu'une émulsion se forme, ladite émulsion étant maintenue jusqu'à la fin de la réaction enzymatique, et de sorte qu'une fois la réaction enzymatique terminée, la cyanhydrine R correspondante est isolée du mélange réactionnel.

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