Sodium Thiosulfate → Ethyl 3-[1-(2-amino-4-fluorophenyl)-1H-imidazol-2-yl]-propanoate

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Reaction Steps

Ethyl 3-[1-(4-fluoro-2-nitrophenyl)-1H-imidazol-2-yl]-propanoate as synthesized in above Production Example 91, 210 mg was dissolved in 1 mL of acetic acid and 1 mL of water, to which 533 mg of 85% sodium hyposulfite was added, followed by 2.5 hours' heating under reflux. The reaction liquid was allowed to cool off and rendered weakly alkaline with saturated aqueous sodium hydrogencarbonate solution, which was extracted with ethyl acetate. The extract was washed with saturated brine and dried over sodium sulfate. Distilling the solvent off under reduced pressure, 100 mg of the title compound was obtained.

Provenance & Evidence