Inversion of Diastereoselectivity Depending on Substrate Concentration in Baker’s Yeast Catalyzed Reduction of σ-Symmetrical 1,3-Cyclopentadiones and 1,3-Cyclohexadiones
作者:Manabu Node、Takahiro Katoh、Shinsuke Mizumoto、Masato Fudesaka、Yuki Nakashima、Tetsuya Kajimoto
DOI:10.1055/s-2006-949647
日期:2006.9
Inversion of diastereoselectivity caused by a change in substrate concentration was first observed in baker’s yeast catalyzed reduction of Ï-symmetrical 2,2-dialkylated cyclopentan-1,3-diones 1,2 and cyclohexan-1,3-dione 20. The selectivity altered by degrees depending on the substrate concentration from 8 mM to 40 mM. Meanwhile, application of the yeast-catalyzed reduction to the hydrogenated compound (5) of 1 afforded a single diastereomer in good yield when the reaction was conducted in high substrate concentration (40 mM).
在面包酵母催化的β-对称性2,2-二烷基环戊烷-1,3-二酮1,2和环己烷-1,3-二酮20的还原反应中,首次观察到了由于底物浓度变化而导致的非对映选择性反转。随着底物浓度从8 mM增加到40 mM,选择性逐渐发生变化。同时,当在高底物浓度(40 mM)下进行反应时,酵母催化的还原反应应用于1的氢化产物(5)时,可以高产率得到单一非对映异构体。