Both enantiomers of Wieland-Miescher ketone [3,4,8, 8a-tetrahydro-8a-methyl-1,6(2H,7H)-naphthalenedione], in a highly enantiomerically enriched form, became readily available by a newly developed kinetic resolution with yeast-mediated reduction. From a screening of yeast strains, Torulaspora delbrueckii IFO 10921 was selected. The collected cells of this strain, obtained by an incubation in a glucose
Wieland-Miescher酮的两种对映异构体[3,4,8,8a-四氢-8a-甲基-1,6(2H,7H)-
萘二酮],以高度对映异构体富集的形式,通过新开发的动力学拆分方法可轻松获得酵母介导的还原。从酵母菌株的筛选中,选择了Torulaspora delbrueckii IFO 10921。通过在
葡萄糖培养基中温育获得的该菌株的收集细胞仅平滑地还原了(S)-对映异构体的分离的羰基,而(R)-对映异构体保持完整。从已建立的脯
氨酸介导的不对称罗宾逊环化反应制得的两种对映体(约70%ee)开始,用德氏布鲁氏菌还原,得到(R)-对映体(98%ee)和相应的醇(4aS,5S)-4 ,4a,5,6,7,8-六氢-5-羟基-4a-甲基-2(3H)-
萘酮(94%ee,制备规模为94%de),收率接近定量。Wieland-Miescher酮的不对称合成方法也很成功。用该菌株还原前手性前体2-甲基-2-(3-氧代丁基)-1