Stereoselective reduction of carbonyl compounds using the cell-free extract of the earthworm, Lumbricus rubellus, as a novel source of biocatalyst
2006
Ishihara, K.(Okayama Univ. of Science (Japan)) | Nakajima, N.
We found the reducing activity toward carbonyl compounds in the cell-free extract of the earthworm, Lumbricus rubellus. The earthworm extract had a reducing activity for keto esters in the presence of NADH or NADPH as a coenzyme. The earthworm extract reduced ethyl 3-methyl-2-oxobutanoate to the corresponding alcohol with a high enantiomeric excess (91%, R-form) at 50 deg C in the presence of NADH. In particular, ethyl 2-oxoheptanoate was exclusively reduced to the corresponding (R)-hydroxyl ester with a high enantiomeric excess ( 99%).
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