Stereoselective Synthesis of 7,11-Guaien-8,12-olides from Santonin. Synthesis of Podoandin and (+)-Zedolactone A
作者:Gonzalo Blay、Victoria Bargues、Luz Cardona、Begoña García、José R. Pedro
DOI:10.1021/jo000927h
日期:2000.10.1
4alpha-epoxide 15. The basic hydrolysis of the 10-acetyl group in compound 18 took place with concomitant intramolecularconjugatedaddition of the alkoxide to the butenolide moiety to give ether 19. Cleavage of the 7,10-oxido bridge via the lactone enolate afforded (+)-zedolactone A (ent-6). This synthesis has allowed for the establishment of the absolute stereochemistry of natural zedolactone A as the enantiomer