Stereoselectivity of Baker's Yeast Reduction of 2-Propanones: Influence of Substituents.
作者:Viggo Waagen、Vassilia Partali、Ingjerd Hollingsæter、Man Shun Soon Huang、Thorleif Anthonsen、Hari N. Pati、Kirpal S. Bisht、Virinder S. Parmar、George W. Francis
DOI:10.3891/acta.chem.scand.48-0506
日期:——
The stereoselectivity of Baker's yeast reduction of prochiral alpha-oxygenated 2-propanones has been studied by varying the substrate structure. The 1-hydroxy-3-methoxy-3-propanone 1a was reduced to the corresponding alcohol (R)-2a with 88% enantiomeric excess. Replacing the hydroxy group in 1a with phenoxy or benzyloxy (1b and 1c) gave the alcohols (S)-2b and (S)-2c with 53 and 32% ee, respectively
通过改变底物结构,研究了贝克酵母还原手性α-加氧2-丙烷的立体选择性。将1-羟基-3-甲氧基-3-丙烷1a还原为相应的醇(R)-2a,对映体过量为88%。用苯氧基或苄氧基(1b和1c)取代1a中的羟基,分别得到具有53%和32%ee的醇(S)-2b和(S)-2c。还原甲基酮1d,得到具有91%ee的醇(S)-2d。尝试通过降低底物浓度或添加选择性还原酶抑制剂来提高1c还原的对映选择性,对映选择性的影响很小。