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。
Chemical consequences of conformation in macrocyclic compounds
作者:W.Clark Still、Igor Galynker
DOI:10.1016/s0040-4020(01)93273-9
日期:——
In this paper we show that the conformational properties of medium- and large-ring organic molecules have profound consequences on the stereochemical course of their chemical reactions. Kinetic enolate alkylations, dimethylcuprate additions and catalytic hydrogenations were examined on a variety of monosubstituted 8- to 12-membered macrocyclic ketones and lactones, and the diastereomeric composition