V. Blanchotcourtois et al., AN APPROACH TO THE A,B RING-SYSTEM OF FORSKOLIN USING 1,4-DIOXENE, Bulletin de la Societe chimique de France, 131(7), 1994, pp. 794-800
A methodology is reported for the early introduction of the C-6 and C-
7 oxygenated groups in the A,B ring system of forskolin, based on the
use of 1,4-dioxene. The key intermediate in this approach is the allyl
ic alcohol, 7, obtained by treatment of the oxygenated diene 6 with br
omine-sodium carbonate.