C - Chemistry – Metallurgy – 12 – P
Patent
C - Chemistry, Metallurgy
12
P
C12P 13/00 (2006.01) C12P 41/00 (2006.01)
Patent
CA 2415190
A process for preparing protected, enantiomer-enriched cyanohydrins of the formula (see formula I) where R1 and R2 independently of one another can be an unsubstituted, monosubstituted or polysubstituted C1-C20-alkyl, C5-C20-aryl, C5-C20-heteroaryl, C5-C20-alk- aryl, C5-C20-alkylheteroaryl or C5-C20-aralkyl radical or an unsubstituted, monosubstituted or polysubstituted C5-C20-heterocycle, or C5-C20-alkylheterocycle or together can be an unsubstituted or substituted C4-C20-alkylene radical, which can contain one or more heteroatoms in the chain, or one of the radicals is hydrogen, and R3 can be an unsubstituted or substituted C1-C20-alkyl, C5-C20-aryl or C5-C20-heteroaryl radical, by reacting an aldehyde or ketone of the formula (see formula II) where R1 and R2 are defined as above, in the presence of an (R)- or (S)-hydroxynitrile lyase in an organic, aqueous or 2-phase system or in emulsion at a temperature of -5 to +40°C with a carbonic ester nitrile of the formula (see formula III) where R3 is defined as above.
Mayrhofer Herbert
Neuhofer Rudolf
Poechlauer Peter
Skranc Wolfgang
Wirth Irma
Dsm Fine Chemicals Austria Nfg Gmbh & Co Kg
Riches Mckenzie & Herbert Llp
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