Stereochemical control in microbial reduction. 19. Effect of heat-treatment on the diastereoselectivity in the reduction with baker's yeast
作者:Kaoru Nakamura、Yasushi Kawai、Atsuyoshi Ohno
DOI:10.1016/0040-4039(91)80651-l
日期:1991.6
Diastereoselectivity in the reduction of 2-alkyl-3-oxobutanoates is controlled by the heat-treatment of bakers' yeast. The heat-treated yeast exerts higher syn-selectivities than the untreated one.
diastereoselectivity in a bakers’ yeastreduction of various alkyl 2-alkyl-3-oxoalkanoates can be controlled by a thermal treatment of the yeast in the presence of methyl vinyl ketone. Pretreated bakers’ yeast gives the corresponding (2R,3S)-hydroxy esters selectively. Two β-keto ester reductases, named L-enzyme-1 and L-enzyme-2, are actual reductants of intact bakers’ yeastreduction. The thermal stability