Abstract
Desymmetrization of prochiral 3-substituted glutaronitriles offers a new approach to access (S)-Pregabalin and (R)-Baclofen. A number of nitrilases from diverse sources were screened with 3-isobutylglutaronitriles (1a) or 3-(4′-chlorophenyl)glutaronitriles (1b) as the substrate. Some nitrilases were found to catalyze the desymmetric hydrolysis of 1a and 1b to form optically active 3-(cyanomethyl)-5-methylhexanoic acid (2a) and 3-(4′-chlorophenyl)-4-cyanobutanoic acid (2b) with high enantiomeric excesse (ee), respectively. This cannot be achieved using traditional chemical hydrolysis. Among them, AtNIT3 generated (R)-2b, whereas BjNIT6402 and HsNIT produced the opposite (S)-enantiomer with high conversions and ee values. Not only the nitrilases showed different activities and stereoselectivities toward these 3-substituted glutaronitriles, the 3-substituent of the substrates also exerted great effect on the enzyme activity and stereoselectivity. (S)-2a and (S)-2b were prepared with high yields and ee values using BjNIT6402 and HsNIT as the biocatalysts, respectively. A straightforward Curtius rearrangement of (S)-2a and (S)-2b, followed by the acidic hydrolysis, afforded (S)-Pregabalin and (R)-Baclofen. This offers a new platform methodology for the synthesis of optically active β-substituted γ-amino acids of pharmaceutical importance.
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Dedicated to Professor Qian Changtao on the occasion of his 80th birthday.
These authors contributed equally to this work
WU QiaQing received his BSc, MSc in Biochemistry and PhD in Genetics from Sichuan University in 1986, 1992 and 2004, respectively. He is a Professor in Tian** Institute of Industrial Biotechnology, Chinese Academy of Sciences. Before joining TIB, he was Deputy Director in the department of genetic engineering drugs, Chengdu Di-Ao pharmaceutical group Co., Ltd. His current research interests are focused on discovery, improvement and applications of industrial enzymes.
ZHU DunMing obtained a BSc from University of Science and Technology of China in 1987, and his MSc and PhD from Shanghai Institute of Organic Chemistry in 1990 and 1993, respectively, under the supervision of Professor Changtao Qian. He is a Professor in Tian** Institute of Industrial Biotechnology, Chinese Academy of Sciences. He was honored by “Hundred Talents Program” of Chinese Academy of Sciences in 2008, and “Thousand Talents Program” of Tian** City in 2009. His research interests range from discovery of novel industrial enzymes to understanding of biocatalytic reaction mechanisms, and the integration of biocatalysis into complex organic synthesis.
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Duan, Y., Yao, P., Ren, J. et al. Biocatalytic desymmetrization of 3-substituted glutaronitriles by nitrilases. A convenient chemoenzymatic access to optically active (S)-Pregabalin and (R)-Baclofen. Sci. China Chem. 57, 1164–1171 (2014). https://doi.org/10.1007/s11426-014-5139-2
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DOI: https://doi.org/10.1007/s11426-014-5139-2