Fes. Souza et R. Rodrigo, Progress towards viridin: synthesis of the pentacyclic furanosteroid ring system via o-benzoquinonoid cycloadditions, CHEM COMMUN, (19), 1999, pp. 1947-1948
The pentacyclic ring system of viridin is synthesised in nine steps from 4-
methylguaicol by means of successive cycloadditions involving o-benzoquinon
oid intermediates generated in situ.