Pyridine → HCID 15251367, compound

Participants

Reaction Steps

A mixture of 4-pregnene-11β,17α-diol-3,20-dione (2) (2 g), acetic anhydride (10 ml), pyridine (20 ml) and 4-dimethylaminopyridine (20 mg) was stirred for 6 hours at room temperature. The reaction mixture was diluted with water (50 ml) and extracted with chloroform. The chloroform layer was sequentially washed with 10% HCl, a 5% aqueous NaHCO3 solution, and brine, dried over Na2SO4, and concentrated. The residue was subjected to column chromatography (silica gel, 150 g) using 70% chloroform/hexane as eluant, thereby obtaining an acetylated derivative (3) (2.24 g, 100%). Recrystallization from ethyl acetate/hexane afforded white crystals having a melting point of 159.5°-160° C.

Provenance & Evidence