5beta-Chol-9(11)-en-24-oic acid, 3alpha-hydroxy-12-oxo-, methyl ester, acetate → (R)-Methyl 4-((3R,5R,8R,9S,10S,13R,14S,17R)-3-acetoxy-10,13-dimethyl-12-oxohexadecahydro-1H-cyclopenta[a]phenanthren-17-yl)pentanoate

Participants

Reaction Steps

10% Pd/C (900 mg) was added to a solution of compound 1.9a (2.0 g, 4.5 mmol) in EtOAc (150 mL) and the resulting slurry was hydrogenated in a Parr apparatus (50 psi) at 50° C. for 16 h. At this point the reaction was determined to be complete by TLC. The mixture was filtered through a small plug of Celite® and the solvent was removed under vacuum, providing compound 2.0a (1.6 g, 80% yield) as a white solid.

Provenance & Evidence