Enantioselective synthesis of (3R,6S,7R,18R,19S)-, (3R,6S,7R,18R,19R)-, and (3R,6S,7R,18S,19R)-quassiols A. A comment on the stereochemistry of natural quassiol A

Article abstract of DOI:10.1016/S0040-4039(97)00992-1

(3R,6S,7R,18R,19S)-, (3R,6S,7R,18R,19R)-, and (3R,6S,7R,18S,19R)-Quassiols A were synthesized enantioselectively by using baker's yeast reduction and asymmetric dihydroxylation, but their optical properties were not identical to that of natural quassiol A. Stereostructure of natural quassiol A was proposed.