反应详情

A mixture of 2-(3-(3-chlorophenyl)-1-(dimethylamino)-3-oxoprop-1-en-2-yl)isoindoline-1,3-dione (255 mg, 0.719 mmol, 1 eq) and hydrazine (0.15 mL, 4.8 mmol, 6.6 eq) in 10 mL ethanol was stirred under reflux for 2 hours. The ethanol and excess hydrazine were removed under vacuum. The crude product was purified by flash chromatography on silica gel (50 to 100% ethyl acetate in heptanes) to yield 111.4 mg (80%) of 3-(3-chlorophenyl)-1H-pyrazol-4-amine LCMS (ESI) m+H=194.0; 1H NMR (400 MHz, CD3OD) δ: 7.75 (broad, 1H), 7.65 (broad, 1H), 7.41 (t, 1H), 7.32 and 7.30 (overlapping s and s, 2H).

1. temperatureunder reflux for 2 hours
2. customThe ethanol and excess hydrazine were removed under vacuum
3. customThe crude product was purified by flash chromatography on silica gel (50 to 100% ethyl acetate in heptanes)