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Biocatalytic deracemization: An efficient one-pot synthesis of (R)-α-methyl-4-pyridinemethanol using whole cells of Candida parapsilosis

Saptarshi Ghosh
  • Department of Pharmaceutical Technology, National Institute of Pharmaceutical Education and Research, Sector-67, S. A. S. Nagar-160062, Punjab, India
  • Other articles by this author:
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/ Linga Banoth
  • Department of Pharmaceutical Technology, National Institute of Pharmaceutical Education and Research, Sector-67, S. A. S. Nagar-160062, Punjab, India
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
/ Uttam Chand Banerjee
  • Department of Pharmaceutical Technology, National Institute of Pharmaceutical Education and Research, Sector-67, S. A. S. Nagar-160062, Punjab, India
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
Published Online: 2015-09-10 | DOI: https://doi.org/10.1515/boca-2015-0004


A single-step synthesis of (R)-α-methyl- 4-pyridinemethanol from (RS)-α-methyl-4- pyridinemethanol by stereoinversion using whole cells of Candida parapsilosis is reported. Among the various strains of Candida species examined, C. parapsilosis demonstrated to have the best oxidoreductase system for stereoinversion of (RS)-α-methyl-4-pyridinemethanol. The effect of various physicochemical parameters on the stereoinversion process, were studied. Under optimized conditions approximately 97% enantiomeric excess of (R)-α-methyl-4-pyridinemethanol (eeR) was obtained with 99% yield was obtained. The optimized parameters were determined to be a substrate concentration of 5 mM, pH 8.0, 30°C incubation temperature, and a reaction time of 48 h. The reactions were also carried out in different organic solvents, and maximum stereoinversion was obtained in 1,4-dioxane with 78.4% eeR and 74.7% yield, which are lower than those in phosphate buffer. This whole cell catalysis for the preparation of (R)-α-methyl-4- pyridinemethanol is an example of a green, enantiopure synthesis of secondary alcohols.

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Keywords : biocatalysis; α-methyl-4-pyridinemethanol; stereoinversion; enantiomeric excess


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About the article

Received: 2015-05-15

Accepted: 2015-07-20

Published Online: 2015-09-10

Citation Information: Biocatalysis, Volume 1, Issue 1, Pages 59–66, ISSN (Online) 2353-1746, DOI: https://doi.org/10.1515/boca-2015-0004.

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© 2015 Saptarshi Ghosh et al.. This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License. BY-NC-ND 3.0

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