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DOI: 10.1055/s-0042-1759851
Process Study on the Enzyme-Catalyzed Preparation of Key Chiral Intermediates for Saxagliptin
Abstract
Saxagliptin is a therapeutic drug for diabetes. The key synthesis process of the drug involves catalyzing 2-(3-hydroxy-1-adamantyl)-2-oxoacetic acid (A) into (S)-3-hydroxyadamantane glycine (B), during which enzymes phenylalanine dehydrogenase mutant from Thermoactinomyces intermedius (TiPDHm) and formate dehydrogenase (FDH) were most often used for biocatalysis. However, the process was limited due to difficulty in enzyme preparation and a low conversion rate. This study focuses on co-expression of TiPDHm and FDH in recombinant Escherichia coli, cell homogenate clarification, enzyme concentration as well as the optimized conditions of enzyme-catalyzed reaction. Our data showed that the wet weight density of bacteria reached 300 g/L, and the yields of TiPDHm and FDH were 7674.24 and 2042.52 U/L, respectively. The combination of ammonium formate and polyethyleneimine favors the clarification of the bacteria homogenate. The clarified enzyme solution obtained can be concentrated by ultrafiltration and directly used in a reductive amination reaction in a high concentration of keto acid A. The reaction time was only 12 hours and the conversion rate reached 95%. Therefore, this process could provide a reference for enzyme-catalyzed preparation of saxagliptin on an industrial scale.
Keywords
saxagliptin - phenylalanine dehydrogenase - formate dehydrogenase - clarification - biocatalysis - reductive aminationSupplementary Information
The results of liquid chromatography-tandem mass spectrometry (LC-MS) analysis and chiral analysis of product B are shown in the Supporting Information ([Supplementary Figs. S1] and [S2] [online only]).
Publication History
Received: 22 May 2022
Accepted: 15 November 2022
Article published online:
26 December 2022
© 2022. The Author(s). This is an open access article published by Thieme under the terms of the Creative Commons Attribution License, permitting unrestricted use, distribution, and reproduction so long as the original work is properly cited. (https://creativecommons.org/licenses/by/4.0/)
Georg Thieme Verlag KG
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