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Biocatalytic synthesis of chiral intermediates for antiviral and antihypertensive drugs

  • Published:
Journal of the American Oil Chemists' Society

Abstract

The chiral intermediate (1S,2R) [3-chloro-2-hydroxy-1-(phenylmethyl)propyl] carbamic acid, 1,1-dimethylethyl ester 2a was prepared for the total synthesis of a human immunodeficiency virus protease inhibitor, BMS-186318. The stereoselective reduction of (1S) [3-chloro-2-oxo-1(phenylmethyl)propyl] carbamic acid, 1,1-dimethylethyl ester 1 was carried out using microbial cultures, among which Streptomyces nodosus SC 13149 efficiently reduced 1 to 2a. A reaction yield of 80%, enantiomeric excess (e.e.) of 99.8%, and diastereomeric purity of 99% were obtained for chiral alcohol 2a. Chiral l-6-hydroxy norleucine 3, an intermediate in the synthesis of antihypertensive drug, was prepared by reductive amination of 2-keto-6-hydroxyhexanoic acid 4 using beef liver glutamate dehydrogenase. The cofactor NADH required for this reaction was regenerated using glucose dehydrogenase from Bacillus sp. A reaction yield of 80% and e.e. of 99.5% were obtained for l-6-hydroxynorleucine 3. To avoid the lengthy chemical synthesis of the ketoacid, a second route was developed in which racemic 6-hydroxynorleucine [readily available from hydrolysis of 5-(4-hydroxybutyl) hydantoin 5] was treated with d-amino acid oxidase from Trigonopsis variabilis to selectively convert the d-isomer of racemic 6-hydroxynorleucine to 2-keto-6-hydroxyhexanoic acid 4 and l-6-hydroxynorleucine 3. Subsequently, the 2-keto-6-hydroxyhexanoic acid 4 was converted to l-6-hydroxynorleucine by reductive amination using glutamate dehydrogenase. A reaction yield of 98% and an e.e. of 99.5% were obtained.

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Authors and Affiliations

  1. Department of Enzyme Technology, Process Research, Bristol-Myers Squibb Pharmaceutical Research Institute, P.O. Box 191, 08903, New Brunswick, NJ

    Ramesh N. Patel

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Correspondence to Ramesh N. Patel.

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Patel, R.N. Biocatalytic synthesis of chiral intermediates for antiviral and antihypertensive drugs. J Amer Oil Chem Soc 76, 1275–1281 (1999). https://doi.org/10.1007/s11746-999-0139-7

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  • DOI: https://doi.org/10.1007/s11746-999-0139-7

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