反应详情

Ethyl 3-(6-methoxy-2-naphthyl)-3-oxopropanoate (5.0 g, 18.3 mmol) and anhydrous hydrazine (0.63 ml 20 mmol) were refluxed in HOAc (100 ml) for 3 hours. Solvent was removed under reduced pressure, and the residue was washed with DCM and collected by filtration to give 5-(6-methoxy-2-naphthyl)-2,4-dihydro-3H-pyrazol-3-one as an off-white solid. This compound exists in the enol form in DMSO. NMR (500 MHz, DMSO-d6) δ: 3.87 (s, 3H); 5.95 (s, 1H); 7.17 (dd, J=2.7 Hz, 9.0 Hz, 1H); 7.31 (d, J=2.7 Hz, 1H); 7.74˜7.84 (m, 3H); 8.11 (br s, 1H); 9.66 (br s, 1H); 12 (br, 1H). MS C14H12N2O2 Cald: 240.09, Obsd: (M+1) 241.08.

1. customSolvent was removed under reduced pressure
2. washthe residue was washed with DCM
3. filtrationcollected by filtration