absolute configuration of the attached aglycones. The concise set of data thus obtained also makes clear that the proposed structure of the fattiviracins, a seemingly closely related family of glycoconjugates, is not matched by the published data. Finally, the biological activity of synthetic 1 and some of the keyintermediates obtained en route to this natural product was investigated, showing that
Enzymatic Resolution of Medium-Ring Lactones. Synthesis of (<i>S</i>)-(+)-Phoracantholide I
作者:Elie Fouque、Gérard Rousseau
DOI:10.1055/s-1989-27351
日期:——
The horse liver and pig liver esterase hydrolysis of racemic medium ring lactones gives with excellent enantiomeric excess the S- (or R) lactones and the corresponding R- (or S) hydroxy acids. This is the first general method to obtain optically pure medium ring lactones. Application to the preparation of (S)-(+)-Phoracantholide I is reported.
马肝和猪肝酯酶对外消旋中环内酯的水解反应,以优异的对映体过量得到 S-(或 R)内酯和相应的 R-(或 S)羟基酸。这是获得光学纯中环内酯的第一个通用方法。报道了该方法在制备 (S)-(+)-Phoracantholide I 中的应用。
Biocatalytic resolution of (±)-hydroxyalkanoic esters. A strategy for enhancing the enantiomeric specificity of lipase-catalyzed ester hydrolysis.
作者:A. Scilimati、T.K. Ngooi、Charles J. Sih
DOI:10.1016/s0040-4039(00)80643-7
日期:1988.1
A general biocatalyticresolution procedure for the preparation of a variety of - and -hydroxyalkanoic esters of high optical purity has been developed. The noteworthy feature of this methodology resides in the selection of a non-hydrolyzable ester at the carboxyl terminus to improve the enantiospecificity in the lipase-catalyzed hydrolysis of the acyloxy ester.