Cesium carbonate → 5-Bromo-3-(imidazo[1,2-a]pyrimidin-7-ylamino)-1-methylpyridin-2(1H)-one

Participants

Reaction Steps

A 250-mL round-bottomed flask equipped with a magnetic stirrer and a reflux condenser was charged with 199a (2.2 g, 16.4 mmol), 3,5-dibromo-1-methylpyridin-2(1H)-one (8.77 g, 32.8 mmol), Pd2 dba3 (1.5 g, 1.64 mmol), Xantphos (1.88 g, 3.28 mmol), Cs2CO3 (10.7 g. 32.8 mmol), and 1,4-dioxane (150 mL). The system was evacuated and then refilled with N2. It was then heated at reflux for 3 h. After the completion of the reaction, the mixture was filtered off and the solid was washed with methanol (60 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 199b as a light green solid (1.63 g, 31%). MS: [M+H]+ 320.1

Provenance & Evidence