Enzymatic process for the preparation of optically active...

Details Enzymatic process for the preparation of optically active... Enzymatic process for the preparation of optically active...

C - Chemistry, Metallurgy

12

P

195/65, 195/86

C12P 13/00 (2006.01)

Patent

CA 1335269

The enzymatic reaction of aliphatic, aromatic or heteroaromatic aldehydes or ketones with hydrocyanic acid to form the corresponding R- cyanohydrins or S-cyanohydrins is carried out in an aqueous medium in the presence of R-oxynitrilase (4.1.2.10) or oxynitrilase (4.1.2.11) under acid conditions and at temperatures such that the competing chemical reaction and racemization are negligible compared with the enzymatic synthesis. The process is preferably carried out at a pH of ?4.5 and at reaction temperatures between -5°C and +50°C. The reaction is preferably carried out continuously, advantageously in an enzyme membrane reactor. Of particular interest is the conversion of aromatic aldehydes into the corresponding optically active cyanohydrins.

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