Cesium carbonate → 6-Chloro-2-methyl-4-({5-[(morpholin-4-yl)carbonyl]pyridin-2-yl}amino)-2,3-dihydropyridazin-3-one

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Reaction Conditions

Reaction Steps

6-aminopyridin-3-yl-morpholino-methanone (800 mg, 3.86 mmol, Eq: 1.00), 4-bromo-6-chloro-2-methylpyridazin-3(2H)-one (1 g, 4.48 mmol, Eq: 1.16), cesium carbonate (4.4 g, 13.5 mmol, Eq: 3.5) and xantphos (335 mg, 579 μmol, Eq: 0.15) were suspended in dioxane (40 ml). The suspension was degassed with argon. Finally Pd2(dba)3 (265 mg, 290 μmol, Eq: 0.075) was added and the reaction mixture was stirred at 90° C. over night under an argon atmosphere. The reaction mixture was allowed to cool to room temperature, and then filtered over celite. Filtrate was concentrated in vacuo to give a light brown solid. The crude material was purified by flash chromatography (silica gel, 110 g, 0% to 10% MeOH in (EtOAc 1:1 Hex) to afford a light yellow solid (408 mg, 1.17 mmol). MS (H+)=350.0 1H NMR (300 MHz, CHLOROFORM-d) δ ppm 3.60-3.80 (m, 8H) 3.83 (s, 3H) 6.96 (d, J=8.69 Hz, 1H) 7.77 (dd, J=8.50, 2.45 Hz, 1H) 8.35-8.44 (m, 2H) 8.47 (d, J=2.27 Hz, 1H)

Provenance & Evidence