Scensidin, a new depsidone from the lichen Buellia canescens(Dicks.) De Not
- 1 January 1983
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Journal of the Chemical Society, Perkin Transactions 1
- No. 2,p. 413-416
- https://doi.org/10.1039/p19830000413
Abstract
The biogenetically favoured constitution (4) for scensidin isolated from Buellia canescens has been established by total synthesis. Intramolecular oxidative coupling of the tetrahydroxybenzophenone (22) yields the grisadienedione (23) which, by thermal isomerisation (23)→(25) followed by methylation, yields scensidin (4). Alternatively, methylation of the grisadienedione (23) followed by thermal isomerisation also yields scensidin. The transformation of the grisadienedione (26) into the dibenzofuran (28) occurs both thermally and photochemically.This publication has 0 references indexed in Scilit: