3(R)-Pyrrolidinyloxyamine dihydrochloride → (2R,3E,8R,9S,10S,13S,14S)-2-fluoro-10,13-dimethyl-3-[(3R)-pyrrolidin-3-yl]oxyimino-2,4,5,6,7,8,9,11,12,14,15,16-dodecahydro-1H-cyclopenta[a]phenanthren-17-one;hydrochloride

Participants

Reaction Steps

2α-Fluoroandrostane-3,17-dione (315 mg) and 3-(R)-pyrrolidinyloxyamine dihydrochloride (Preparation 12, 190 mg) were dissolved in pyridine (5 ml) and stirred at RT for 1 h. After evaporation of the solvent, the crude reaction mixture was purified by flash chromatography (SiO2, CHCl3/MeOH/26% NH4OH 90/10/1). To the resulting oil obtained after fractions evaporation, dissolved in a 1/1 mixture of EtOAc/Et2O (20 ml) and cooled with an ice bath, an excess of 2N HCl solution in Et2O was added. The title compound I-bh was obtained, after filtration, as a white solid in 91% yield.

Provenance & Evidence