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An optimized method for an (2R,3S)-isocitric acid building block

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Abstract

An optimized method for (2R,3S)-isocitric acid lactone-2,3-dicarboxylic acid dimethyl ester as an (2R,3S)-isocitric acid building block based on a fermentation solution containing both (2R,3S)-isocitric acid (ICIT) and citric acid is described. The number of operations needed until now has been reduced; some steps have been modified, making altogether the method distinctly faster. During the course of this investigation, crystal structures have been determined of (2R,3S)-isocitric acid lactone-2,3-dicarboxylic acid dimethyl ester, (2R,3S)-isocitric acid lactone-2,3-dicarboxylic acid, and (2R,3S)-isocitric acid lactone-2,3-dicarboxylic acid anhydride. For the first time, full NMR data are given for ICIT trimethyl ester and ICIT lactone-2,3-dicarboxylic acid dimethyl ester. The multigram amounts of the three ICIT lactone compounds open the way for the synthetic use of ICIT generated in a biotechnological process.

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Acknowledgements

We are grateful to Katrin Hoffmann and Tamara Meinel for their unimpeachable support with NMR measurements throughout many years. We thank Prof. Dr. Joachim Sieler for his continuous support of our investigations.

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Authors and Affiliations

  1. Institute of Organic Chemistry, Universität Leipzig, Leipzig, Germany

    Kristin Bullin, Lothar Hennig, Renate Herold, Karin Richter & Dieter Sicker

  2. Institute of Inorganic Chemistry, Universität Leipzig, Leipzig, Germany

    Harald Krautscheid

Authors
  1. Kristin Bullin
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  2. Lothar Hennig
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  3. Renate Herold
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  4. Harald Krautscheid
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  5. Karin Richter
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  6. Dieter Sicker
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Corresponding author

Correspondence to Dieter Sicker.

Additional information

Dedicated to Prof. Dr. Athanassios Giannis on the occasion of his 65th birthday.

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Bullin, K., Hennig, L., Herold, R. et al. An optimized method for an (2R,3S)-isocitric acid building block. Monatsh Chem 150, 247–253 (2019). https://doi.org/10.1007/s00706-018-2319-3

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  • DOI: https://doi.org/10.1007/s00706-018-2319-3

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