(R)-(+)-Paraconic acid 4, (S)-(-)-terebic acid 6 and their corresponding methyl and ethyl esters having ee's ranging from 60% to 92% were obtained by enzymatic resolution of their racemates. The enzymatic resolution of racemic ethyl gamma-methylparaconates 14a and 14b allowed the isolation of the unreacted ester (2R,3R)-(+)-14a and that of the lactonic acid (2S,3R)-(-)-5b with 80% and 93% ee, respectively, the former by the use of Horse liver acetone powder (HLAP), the latter using a-chymotrypsin (a-CT). The enantiomeric ethyl (2S,3S)-(-)-14a and (2S,3R)-(-)-14b, both with >99% ee, were obtained by baker's yeast reduction of diethyl acetylsuccinate.
Chemoenzymatic synthesis of enantioenriched 5-oxo-tetrahydro-3-furancarboxylic acid derivatives
FORZATO, Cristina;NITTI, PATRIZIA;PITACCO, GIULIANA;VALENTIN, ENNIO
2004-01-01
Abstract
(R)-(+)-Paraconic acid 4, (S)-(-)-terebic acid 6 and their corresponding methyl and ethyl esters having ee's ranging from 60% to 92% were obtained by enzymatic resolution of their racemates. The enzymatic resolution of racemic ethyl gamma-methylparaconates 14a and 14b allowed the isolation of the unreacted ester (2R,3R)-(+)-14a and that of the lactonic acid (2S,3R)-(-)-5b with 80% and 93% ee, respectively, the former by the use of Horse liver acetone powder (HLAP), the latter using a-chymotrypsin (a-CT). The enantiomeric ethyl (2S,3S)-(-)-14a and (2S,3R)-(-)-14b, both with >99% ee, were obtained by baker's yeast reduction of diethyl acetylsuccinate.Pubblicazioni consigliate
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