Stereochemical Control in Microbial Reduction. XXIII. Thermal Treatment of Bakers’ Yeast for Controlling the Stereoselectivity of Reductions
作者:Yasushi Kawai、Shin-ichi Kondo、Munekazu Tsujimoto、Kaoru Nakamura、Atsuyoshi Ohno
DOI:10.1246/bcsj.67.2244
日期:1994.8
diastereoselectivity in a bakers’ yeast reduction 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’ yeast reduction. The thermal stability
面包师酵母还原各种 2-烷基-3-氧代链烷酸烷基酯的非对映选择性可以通过在甲基乙烯基酮存在下对酵母进行热处理来控制。预处理的面包酵母选择性地产生相应的 (2R,3S)-羟基酯。两种 β-酮酯还原酶,称为 L-酶-1 和 L-酶-2,是完整面包酵母还原的实际还原剂。纯化酶的热稳定性和抑制常数可以决定预处理面包酵母减少的立体化学结果。