Diethyl Ether → 3-Hydroxy-2-methoxymethylestra-1,3,5(10)-trien-17-one

Participants

Reaction Steps

To a suspension of 2-dimethylaminomethyl-3-hydroxyestra-1,3,5(10)-trien-17-one (72, 2.0 g, 6.1 mmol) in Et2O (200 mL) was added iodemethane (10 mL, 161 mmol) and stirred for 20 h at room temperature. The precipitate was collected by filtration and washed with Et2O. The solid was dissolved in MeOH (50 mL) and added potassium hydroxide (5.0 g, 85%, 76 mmol), and stirred for 3 h at reflux condition. After the reaction mixture was cooled to room temperature, solvent was evaporated at reduced pressure until half volume. The reaction mixture was acidified with 5 N HCl at 0° C., and extracted with Et2O. The combined organic layers were washed with H2O, saturated aqueous NaCl, and then dried (Na2SO4). The desiccant was filtered and the solvent was evaporated at reduced pressure. The residue was purified by column chromatography (silica gel) using CHCl3 :EtOAc (15:1→10:1, v/v) to afford 1.34 g of 74 (88% yield) mp: 149-151° C.

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