A highly enantioselective chemoenzymatic synthesis of syn-3-amino-2-hydroxy esters: key intermediates for taxol side chain and phenylnorstatine
作者:J. Augusto R. Rodrigues、Humberto M.S. Milagre、Cíntia D.F. Milagre、Paulo J.S. Moran
DOI:10.1016/j.tetasy.2005.08.015
日期:2005.9
Starting from the bromination of α-ketoesters to obtain 3-bromo-2-oxoalkanoates and bioreduction with Saccharomyces cerevisiae entrapped in calcium alginate pellets with double gel layers, syn-(2R,3S)-β-bromo-α-hydroxy esters were obtained regioselectively in high yields and high ee. These chiral bromohydrins were cyclized to epoxides that were transformed into oxazolidines and finally opened by acidic