Chemoenzymatic Asymmetric Total Synthesis of (<i>R</i>)-Lasiodiplodin Methyl Ether through a Sulfatase-Based Deracemization Process
作者:Michael Fuchs、Michael Toesch、Markus Schober、Christiane Wuensch、Kurt Faber
DOI:10.1002/ejoc.201201296
日期:2013.1
lasiodiplodin, was synthesized through a seven-step linear sequence. Chirality was introduced through a sulfatase-based deracemization process, in which a functionalized (rac)-sec-sulfate ester was enzymatically hydrolyzed with inversion of the stereocenter using an alkyl sulfatase. The remaining sulfate ester enantiomer was hydrolyzed with retention of configuration under acidic conditions, yielding the chiral
(R)-Lasiodiplodin 甲基醚是抗白血病药物 lasiodiplodin 的前体,通过七步线性序列合成。手性是通过基于硫酸酯酶的去外消旋过程引入的,其中使用烷基硫酸酯酶对功能化的 (外消旋)-仲硫酸酯进行酶水解,立体中心反转。剩余的硫酸酯对映体在酸性条件下水解并保留构型,以 93% ee 得到手性关键构件作为唯一产物。全合成通过 Negishi 交叉偶联和闭环复分解完成。