Estradiol → 3,17beta-Bis(benzyloxy)estra-1,3,5(10)-triene

Participants

Reaction Steps

Dimethylformamide (11 ml) was added to β-estradiol (1.08 g, 4.0 mmol) under nitrogen atmosphere, followed by cooling on ice. Sodium hydride (480 mg of 60% suspension) was added to the reaction mixture followed by stirring for 10 minutes on ice and then stirred for 1 hour at room temperature. After cooling again on ice, Benzyl bromide (2.05 g, 12 mmol) was added to the reaction mixture followed by stirring for 10 minutes on ice and then stirred for 20 hours at room temperature. The reaction mixture was quenched with ice-cold water and extracted with ethyl acetate. The organic layer was washed with water and saturated aqueous sodium chloride, dried over anhydrous magnesium sulfate, and then filtered. The filtrate was concentrated under reduced pressure using an evaporator and the resulting residue was triturated with methanol to precipitate solids. The solids were collected by filtration and vacuum dried to give 3,17β-bis(benzyloxy)estra-1,3,5(10)-triene (1.72 g, Yield 95%).

Provenance & Evidence