Influence of alkene substituent in dictating the reaction course to form carbocycles or oxacycles during ring closing metathesis of acyclic trienes
作者:Ritabrata Datta、Subrata Ghosh
DOI:10.1007/s12039-017-1390-3
日期:2017.12
AbstractRing closing metathesis of acyclic trienes that can provide oxacycles or carbocycles has been investigated. It was found that a substituent on one of the alkene units determines the reaction course to provide either oxacycles or carbocyles exclusively irrespective of the ring size of the resulting compounds. Graphical AbstractRing closing metathesis of acyclic trienes with Grubbs’ first generation
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