Abstract
The chiral intermediate (1 S,2 R)-[3-chloro-2-hydroxy-1-(phenylmethyl)propyl]carbamic acid, 1,1-dimethylethyl ester 2a was prepared for the total synthesis of the HIV protease inhibitor Atazanavir. The diastereoselective reduction of (1 S)-[3-chloro-2-oxo-1-(phenylmethyl)propyl] carbamic acid, 1,1-dimethyl-ethyl ester 1 was carried out using microbial cultures among, which Rhodococcus, Brevibacterium, and Hansenula strains reduced 1 to 2a. Three strains of Rhodococcus gave >90% yield. A diastereomeric purity of >98% and enantiomeric excess of >99.3% were obtained for alcohol 2a.
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