Sodium Dithionite → HCID 178509329, compound

Participants

Reaction Steps

5-Nitro-4-(1H-pyrazol-5-yl)thiophene-2-carbaldehyde (40 mg, 0.18 mmol) was dissolved in absolute ethanol (4 mL). A saturated solution of sodium hydrosulfite in water was added dropwise until complete consumption of the starting material (10 minutes). Water (30 mL) added, the aqueous layer extracted with ethyl acetate (3×10 mL), and the resulting organics were dried (Na2SO4) and concentrated under reduced pressure. The crude product was purified by flash chromatography, eluting with ethyl acetate in hexanes, to yield 5-amino-4-(1H-pyrazol-3-yl)thiophene-2-carbaldehyde as a powder (11 mg, 42%). 1H NMR (400 MHZ, DMSO-d6) δ 6.60 (d, J 2.3 Hz, 1H), 7.80 (d, J 2.3 Hz, 1H), 8.02 (s, 1H), 9.49 (s, 1H).

Provenance & Evidence