反应详情

A solution of the nitrogen-unsubstituted pyridazinone product from Example 19 (160 mg, 0.465 mmol), K2CO3 (193 mg, 1.4 mmol), 4-fluorobenzylbromide (0.09 mL, 0.7 mmol) and NaI (catalytic) in 10 mL of anhydrous N,N-dimethylformamide (DMF) was stirred at room temperature for 18 hours. The reaction mixture was quenched with 2N HCl, extracted with ethyl acetate (2×20 mL), washed with brine and water, dried over MgSO4, filtered and concentrated in vacuo. The residue was purified by column chromatography (2:2:6 ethyl acetate/dichloromethane/pentanes). Crystallization from ether/pentanes provided white crystals (yield: 110 mg, 52%). mp 153-154° C. 1H NMR (CDCl3, 300 MHz) δ 3.06 (s, 3H), 5.36 (s, 2H), 6.96 (t, J=8.4 Hz, 2H), 7.04 (t, J=8.7 Hz, 2H), 7.16 (dd, J=9.1 Hz, J=5.4 Hz, 2H), 7.31 (d, J=8.5 Hz, 2H), 7.54 (dd, J=8.8 Hz, 5.5 Hz, 2H), 7.84 (s, 1H), 7.87 (d, J=8.8 Hz, 2H). MS (DCI/NH3) m/z 453 (M+H)+.

1. customThe reaction mixture was quenched with 2N HCl
2. extractionextracted with ethyl acetate (2×20 mL)
3. washwashed with brine and water
4. dry with materialdried over MgSO4
5. filtrationfiltered
6. concentrationconcentrated in vacuo
7. customThe residue was purified by column chromatography (2:2:6 ethyl acetate/dichloromethane/pentanes)
8. customCrystallization from ether/pentanes provided white crystals (yield: 110 mg, 52%)