Highly efficient synthesis of optically active drimanic sesquiterpenes, (+)-fuegin, (+)-epifutronolide (7β-hydroxyisodrimenin) and (+)-7-ketoisodrimenin

Abstract A highly efficient synthesis of (+)-fuegin 4 . (+)-7-epifutronolide (7β-hydroxyisodrimenin) 5a and (+)-7-ketoisodrimenin 6 from manool 1 . is reported.