Synthetic studies on terpenoids. Part 24. Stereocontrolled synthesis of 3αβ-H,3bα-H,5aα-H,9aα-H,11aβ-H-9bβ-Methylperhydrophenanthro-[2,1-b]furan-7-one, an intermediate to epoxynorcafestanone
Abstract
The title compound (17), incorporating rings A, B, C, and E of epoxynorcafestanone (2), has been synthesized. Stereochemical assignments of all the six asymmetric centres present in (17) have been confirmed by an X-ray crystallographic analysis.