Stereoselective lipase-mediated esterifications of epoxy-α-ionol 5 and epoxy-β-ionol 9 afforded suitable precursors of the enantiomers of the corresponding oxidised derivatives epoxy-α-ionone 3 and epoxy-β-ionone 4. An interesting development of this work is the easy conversion of enantiopure 3a and 3b into highly valuable enantiopure (S)- and (R)-ionone (1a and 1b) via a mild deoxygenation reaction.
脂肪酶介导的环氧-δ-酮 5 和环氧-δ-酮 9 的立体选择性酯化反应得到了相应氧化衍
生物环氧-δ-酮 3 和环氧-δ-酮 4 对映体的合适前体。这项工作的一个有趣进展是,通过温和的脱氧反应,对映体纯品 3a 和 3b 很容易转化为高价值的对映体纯品 (S)- 和 (R)-ionone (1a 和 1b)。