Do enzymes recognise remotely located stereocentres? Highly enantioselective Candida rugosa lipase-catalysed esterification of the 2- to 8-methyldecanoic acids
摘要:
Several racemic methyl decanoic acids have been synthesised and Successfully resolved in esterification with 1-hexadecanol at a(w)=0.8 in cyclohexane using immobilised Candida rugosa lipase (CRL) as the catalyst. The enantiomeric ratios (E=2.8-68) obtained were surprisingly high even when the methyl group was as remotely located as in 8-methyldecanoic acid (E=25). Interestingly, the lipase shows enantiopreference for the S-enantiomer when the methyl group is located on even numbered carbons i.e. for the 2-,4-,6- and 8-methyldecanoic acids and to the R-enantiomer when the methyl group is located on uneven numbered carbons i.e. for the 3-,5- and 7-methyldecanoic acids. (C) 2002 Published by Elsevier Science Ltd.
Do enzymes recognise remotely located stereocentres? Highly enantioselective Candida rugosa lipase-catalysed esterification of the 2- to 8-methyldecanoic acids
摘要:
Several racemic methyl decanoic acids have been synthesised and Successfully resolved in esterification with 1-hexadecanol at a(w)=0.8 in cyclohexane using immobilised Candida rugosa lipase (CRL) as the catalyst. The enantiomeric ratios (E=2.8-68) obtained were surprisingly high even when the methyl group was as remotely located as in 8-methyldecanoic acid (E=25). Interestingly, the lipase shows enantiopreference for the S-enantiomer when the methyl group is located on even numbered carbons i.e. for the 2-,4-,6- and 8-methyldecanoic acids and to the R-enantiomer when the methyl group is located on uneven numbered carbons i.e. for the 3-,5- and 7-methyldecanoic acids. (C) 2002 Published by Elsevier Science Ltd.
BRANCHED-CHAIN FATTY ACIDS. XIII. PREPARATION OF BRANCHED AND NORMAL ACIDS FOR USE IN THE STUDY OF MELTING POINTS OF BINARY MIXTURES. COMPLETION OF THE METHYLOCTADECANOIC ACID SERIES
作者:JAMES CASON、W. ROBERT WINANS
DOI:10.1021/jo01147a023
日期:1950.1
Ciocan-Tarta, Ilie; Oprean, Ioan; Ghizdavu, Iustin, Revue Roumaine de Chimie, 1998, vol. 43, # 3, p. 215 - 219
作者:Ciocan-Tarta, Ilie、Oprean, Ioan、Ghizdavu, Iustin、Pojar-Fenesan, Maria
DOI:——
日期:——
Wilson, Journal of the American Chemical Society, 1945, vol. 67, p. 2162