Ethyl Acetate → Methyl 1-(4-cyano-3-fluorophenyl)-6-oxo-4-(1-(5-propylpyrimidin-2-yl)piperidin-4-yloxy)-1,6-dihydropyridazine-3-carboxylate

Participants

Reaction Conditions

Reaction Steps

To a stirring solution of methyl 1-(4-cyano-3-fluorophenyl)-6-oxo-4-(piperidin-4-yloxy)-1,6-dihydropyridazine-3-carboxylate HCl (37.2 mg, 0.10 mmol) in NMP (3 mL) at room temperature under argon was added DIPEA (38.8 mg, 0.30 mmol) and 2-chloro-5-propylpyrimidine (23.5 mg, 0.15 mmol). The resulting reaction mixture was heated at 95° C. under argon overnight. 15 mL of EtOAc was added to the reaction mixture. The reaction mixture was washed with water (15 mL), and brine (15 mL). Organic phase was dried (MgSO4), filtered and concentrated. The crude product was directly purified by preparative HPLC (C18 column; 10-100% methanol in water without TFA) to give methyl 1-(4-cyano-3-fluorophenyl)-6-oxo-4-(1-(5-propylpyrimidin-2-yl)piperidin-4-yloxy)-1,6-dihydropyridazine-3-carboxylate (16 mg, white solid, 32%). 1H NMR (400 MHz, CDCl3) δ ppm 0.56-1.12 (m, 3H) 1.37-1.67 (m, 2H) 1.70-2.20 (m, 4H) 2.39 (q, J=7.47 Hz, 2H) 3.64-4.09 (m, 7H) 4.02-4.40 (m, 1H) 4.40-4.95 (m, 1H) 6.31 (s, 1H) 7.45-7.91 (m, 3H) 7.91-8.46 (m, 2H). MS (ESI) 493 (M+H).

Provenance & Evidence