Cesium carbonate → 5-Bromo-1-methyl-3-(6-(trifluoromethyl)pyridazin-3-ylamino)pyridin-2(1H)-one

Participants

Reaction Conditions

Reaction Steps

A 100-mL single-neck round-bottomed flask equipped with a magnetic stirrer and a reflux condenser was charged with 301a (750 mg, 4.6 mmol), XantPhos (532 mg, 0.92 mmol), Pd2 dba3 (421 mg, 0.46 mmol), 2-bromo-4-chloronicotinaldehyde (H-001) (1.84 g, 6.9 mmol), Cs2CO3 (3.0 g, 9.2 mmol), and 1,4-dioxane (50 mL). The system was subjected to three cycles of vacuum/argon flush and heated at 90° C. for overnight. After the completion of the reaction, the mixture was filtered and the solid was washed with methanol (30 mL). The combined filtrate was evaporated under reduced pressure and the residue was purified by silica-gel column chromatography eluting with 20:1 dichloromethane/methanol to afford 301b (1.38 g, 89%) as a yellow solid. MS-ESI: [M+H]+ 350.8

Provenance & Evidence