Isobutylhydrazine → 3-[1-(2-methylpropyl)-1H-pyrazol-5-yl]-1-(4-morpholin-4-ylphenyl)pyridazin-4(1H)-one

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Reaction Steps

To a solution of 3-[3-(dimethylamino)prop-2-enoyl]-1-(4-morpholin-4-ylphenyl)pyridazin-4(1H)-one (300 mg, 0.85 mmol) in 20 mL of methanol, 2-methylpropylhydrazine (300 mg, 3.39 mmol) was added, the resulting mixture was refluxed for 4 hours, then concentrated. The residue was dissolved in dichloromethane (20 mL), washed with 1 M acetic acid aqueous solution and brine, dried over anhydrous Na2SO4, and concentrated under reduced pressure. The residue was purified by prep-HPLC to give the title compound (48 mg, 15% yield) as a yellow solid: 1H NMR (400 MHz, CDCl3): δ 0.83 (6H, d, J=6.8 Hz), 2.17-2.25 (1H, m), 3.25-3.27 (4H, m), 3.89-3.92 (4H, m), 4.34 (2H, d, J=7.6 Hz), 6.72 (1H, d, J=8.0 Hz), 7.00-7.04 (2H, m), 7.33 (1H, d, J=2.4 Hz), 7.45-7.49 (2H, m), 7.59 (1H, d, J=2.0 Hz), 8.15 (1H, d, J=7.6 Hz); LCMS (mobile phase: from 90% water and 10% CH3CN to 5% water and 95% CH3CN in 6 min, finally under these conditions for 0.5 min.) purity is >95%, Rt=3.396 min; MS Calcd.:379, MS Found: 380 [M+H]+.

Provenance & Evidence