Hydrogen Peroxide → 3-Acetoxyestra-1,3,5(10)-trien-17-one-2-carboxylic acid

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Reaction Steps

To a suspension of 3-acetoxyestra-1,3,5(10)-trien-17-one-2-carboxaldehyde (61, 1.20 g, 3.5 mmol) in acetonitrile (17 mL) and H2O (2.1 mL) were added 30% hydrogen peroxide (0.53 mL) and sodium phosphate monobasic (1.79 g) at room temperature. Sodium chlorite (0.935 g in a H2O (7.0 mL) solution) was added dropwise to the reaction mixture over a 1 h period, and stirring continued for an additional 2 h at room temperature. The reaction mixture was quenched with sodium sulfite, acidified with 10% HCl, and extracted with EtOAc. 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 washed with Et2O to afford 1.06 g of 62 (85% yield) mp: 180-181° C.

Provenance & Evidence