Microbial stereospecific reduction of 3-quinuclidinone with newly isolated Nocardia sp. and Rhodococcus erythropolis

Two bacterium strains, Nocardia sp. WY1202 and Rhodococcus erythropolis WY1406, were isolated from soil samples. They catalyzed the asymmetric reduction of 3-quinuclidinone to give enantiomeric pure (R)- and (S)-3-quinuclidinol, respectively. The optimal temperatures for the bioreduction by Nocardia sp. and R. erythropolis were 30 °C and 37 °C, respectively, while both strains showed highest activity at pH 8.0. Without external addition of expensive NADH or NADPH, (R)-3-quinuclidinol and (S)-3-quinuclidinol were obtained with 93% and 92% isolated yield and >99% enantiomeric excess. As such, microbial reduction by Nocardia sp. WY1202 or R. erythropolis WY1406 offers a new stereospecific approach to both antipodes of 3-quinuclidinol of pharmaceutical importance.