Highly stereoselective reduction of haloketones using three new yeasts: application to the synthesis of (S)-adrenergic β-blockers related to propranolol
作者:Fernando Martı́nez Lagos、Jose D. Carballeira、Jose L. Bermúdez、Emilio Alvarez、Jose V. Sinisterra
DOI:10.1016/j.tetasy.2004.01.024
日期:2004.3
The stereoselective reduction of aryloxy-halo-2-propanones 1 or of 1-chloro-3(phthalimdyl)-propan-2-one 2 using baker's yeast usually displays poor yields and/or ees. Three new yeasts, Saccharomyces bayanus CECT 1317, Yarrowia lipolytica CECT 1240 and Pichia mexicana CECT 1015, were selected after a taxonomical screening looking for microorganisms active in the reduction of ketones. These strains have been used for the highly stereoselective reduction of 1 and 2. This reduction is the key step in the stereoselective synthesis of (S)-adrenergic beta-blockers related to the propranolol structure. P. mexicana (reduction of 1) and S. bayanus (the reduction of 2), gave ees greater than 90%, and yields higher than 85% for the (R)-or (S)-halohydrins, respectively. This process constitutes an efficient alternative to the resolution of halohydrins carried out using lipases and can easily be scaled up. (C) 2004 Elsevier Ltd. All rights reserved.