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。
Convenient double-enzymatic synthesis of both enantiomers of 6-methyl-ε-caprolactone
作者:Bart A.C. van As、Dah-Kee Chan、Patrick J.J. Kivit、Anja R.A. Palmans、E.W. Meijer
DOI:10.1016/j.tetasy.2007.03.016
日期:2007.4
Both enantiomers of 6-methyl-epsilon-caprolactone (6-MeCL) are obtained in high enantiomeric excess by the combination of an enzymatic ring opening of racemic 6-methyl-epsilon-caprolactone and subsequent enzymatic ring closure. Immobilized Candida antarctica lipase B (Novozym 435) was selected as the biocatalyst for both the ring-opening and the ring-closing reaction. This route provides ready access to enantiopure (S)-6-MeCL (ee = 99.6%) and (R)-6-MeCL (ee = 98.8%). (c) 2007 Elsevier Ltd. All rights reserved.
FOUQUE, ELIE;ROUSSEAU, GERARD, SYNTHESIS,(1989) N, C. 661-666