Enantiomerically Pure Octahydronaphthalenone and Octahydroindenone: Elaboration of the Substrate Overcame the Specificity of Yeast-Mediated Reduction
作者:Ken-ichi Fuhshuku、Mina Tomita、Takeshi Sugai
DOI:10.1002/adsc.200303004
日期:2003.6
change into an octahydroindene skeleton retarded the enzymatic reduction and the enantioselectivity fell to E=5–16. Further structural variation into a bicyclo[3.3.0] skeleton led to an exclusive 1,4-conjugate reduction of the α,β-unsaturated carbonyl group, and the above results suggested the participation of plural oxidoreductive enzymes in the whole cell. In turn, among the 2,2-disubstituted cycloalkanediones
研究了用酵母菌株Torulaspora delbrueckii IFO10921还原双环二酮的底物特异性。尽管这种酵母有效地还原了(S)对映体,具有高对映选择性(E = 126),在八氢萘骨架上引入取代基,以及八氢茚骨架上的结构变化阻碍了酶的还原,对映选择性降至E = 5-16 。进一步的结构变化形成双环[3.3.0]骨架导致α,β-不饱和羰基的排他性1,4-共轭还原,上述结果表明多种氧化还原酶参与了整个细胞。反过来,在2,2-二取代的环烷二酮中,发现了良好的底物,可以通过酵母介导的还原反应得到相应的羟基酮当量。分离出环状半缩醛产物,例如(1 S,6 S)-3-乙基-3-羟基-6-甲基-2-氧杂双环[4.4.0] decan-7-one和(1 S,6 S)-3-羟基-3,6-二甲基-2-氧杂双环[ 4.3.0] nonan-7-one。此外,通过使用风干的,长期可保存的细胞制剂,还原效果很