Synthetic Studies on Schisandra nortriterpenoids. Stereocontrolled Synthesis of Enantiopure C-5-<i>epi</i> ABC Ring Systems of Micrandilactone A and Lancifodilactone G Using RCM
作者:Soumitra Maity、Kiran Matcha、Subrata Ghosh
DOI:10.1021/jo1006448
日期:2010.6.18
the spiro-dihydrofuran 25. The ketal unit in 25 was then converted into the carbinols 28 and 36. A bromonium ion initiated highly stereocontrolled intramolecularetherification in 28 and 37 led to the tricyclic ethers 29 and 38, respectively. Reductive removal of bromine from 29 and 38 followed by RuO4 oxidation led to the furo-furanone derivatives 31 and 40, the C-5-epi ABC ring systems of the schisandra