Structures of four new oxygenated lupanes from Pleurostylia opposita(Celastraceae)
- 1 January 1981
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Journal of the Chemical Society, Perkin Transactions 1
- No. 10,p. 2717-2723
- https://doi.org/10.1039/p19810002717
Abstract
Four new oxygenated lupanes isolated from the stem bark of Pleurostylia opposita(Wall) Alston (Celastraceae) have been shown to be lupa-5,20(29)-dien-3-one (2), 6β,20-dihydroxylupan-3-one (5),3β,6β-dihydroxylup-20(29)-ene (6), and 6β,28-dihydroxylup-20(29)-en-3-one (8). The structures of these compounds were established on the basis of spectroscopic (1H n.m.r. and mass spectral) and chemical evidence. Deshielding of three methyl signals in the 1H n.m.r. spectra of 6β-hydroxylupane derivatives has been attributed to 1,3-diaxial interaction between the relevant methyl group and the 6β-hydroxy-group.This publication has 1 reference indexed in Scilit: