反应详情

温度

67.5 °C

To a mixture of 5-(hydroxy-3-methoxy-phenyl)-1-phenyl-pent-4-ene-1,3-dione (0.14 g, 0.48 mmol) and hydrazine monohydrate (0.02 g, 0.48 mmol) were added ethanol (24 mL) and acetic acid (1 drop) in a sealed tube. The reaction was heated at 65-70° C. overnight. The solvent was removed under reduced pressure to afford crude product. Purification on triethylamine treated silica (1:1 hexanes/ethyl acetate) afforded a mixture of two products. Reverse phase HPLC purification afforded 2-(methyloxy)-4-[(E)-2-(5-phenyl-1H-pyrazol-3-yl)ethenyl]phenol (0.015 g, 10% yield) as trifluoroacetate salt: 1H NMR (400 MHz, CDCl3): δ 9.21 (br s, 2H), 7.78 (br s, 2H), 7.42 (m, 3H), 7.20 (br d, 1H), 6.94 (m, 6H), 3.92 (s, 3H); MS (EI) for C18H16N2O2: 293 (MH+).

1. customThe solvent was removed under reduced pressure
2. customto afford crude product
3. customPurification on triethylamine
4. additiontreated silica (1:1 hexanes/ethyl acetate)
5. customafforded
6. additiona mixture of two products
7. customReverse phase HPLC purification