Hydrogen Bromide → (3S,5R,8R,9S,10S,13R,14S,17R)-17-[(E,3E)-3-(4,5-dihydro-1H-imidazol-2-ylhydrazinylidene)prop-1-enyl]-10,13-dimethyl-1,2,3,4,5,6,7,8,9,11,12,15,16,17-tetradecahydrocyclopenta[a]phenanthrene-3,14-diol

Participants

Reaction Steps

A solution of 1.19 g of 2-hydrazino-2-imidazoline hydrobromide in 20 ml of water and 60 ml of dioxane was made acid to pH 3 with 0.1N HBr. A solution of 2.08 g of (E)-3β,14β-dihydroxy-5β-pregn-20-ene-21-carboxaldehyde (Fullerton D. S. et al., J. Med. Chem., 1976, 19, 1330) in 25 ml of dioxane was added at room temperature. After 3 days, the solution was evaporated to dryness under reduced pressure. The crude product was purified by flash chromatography (SiO2) using chloroform/methanol/28% ammonium hydroxide 90/10/1 as the eluant; the fractions containing the title compound were collected and evaporated to dryness. The residue was ground with ethyl acetate and ethanol to give 1.54 g of the title compound (I-ac) as a white solid.

Provenance & Evidence