O-Xylene → HCID 13189280, compound

Participants

Reaction Conditions

Reaction Steps

A mixture of 1.33 g (0.0019 mol) of [1α,3β,7ξ]-7-bromo-24,24-difluorocholest-5-en-1,3,25-triol 1,3-diacetate, 0.8 mL of s-collidine and 10 mL of xylene was heated at reflux (140° C.) for 0.5 hr and cooled. The mixture was diluted with 30 mL of benzene. This solution was washed with 10% aqueous sulfuric acid, and saturated aqueous sodium bicarbonate solution. The organic phase was dried over anhydrous magnesium sulfate, filtered, and evaporated to dryness. The residue was purified by column chromatography on 0.06-0.20 mm silica gel to yield [1α,3β]-24,24-difluorocholesta-5,7-dien-1,3,25-triol 1,3-diacetate, [α]D25 -31° (c 0.4, CHCl3), mp 130°-132°. UV max (C2H5OH) 261 (ε 7750), 270 (ε 11,200), 281 (ε 12,100) and 293 (ε 7100).

Provenance & Evidence