Cyclopentylhydrazine → 3-(1-Cyclopentyl-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, cyclopentylhydrazine (340 mg, 3.39 mmol) was added, the resulting mixture was refluxed for 4 hours, and 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 (30 mg, 9% yield) as a brown solid: 1H NMR (400 MHz, CDCl3): δ 1.46-1.69 (5H, m), 1.92-1.96 (1H, m), 2.04-2.09 (1H, m), 2.14-2.19 (1H, m), 3.22-3.25 (4H, m), 3.87-3.90 (4H, m), 5.10 (1H, quintet, J=3.6 Hz), 6.71 (1H, d, J=8.0 Hz), 6.98-7.01 (2H, m), 7.04 (1H, d, J=1.6 Hz), 7.44-7.47 (2H, m), 7.60 (1H, d, J=2.0 Hz), 8.16 (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=3.196 min; MS Calcd.: 391, MS Found: 392 [M+H]+.

Provenance & Evidence