Cesium carbonate → HCID 72202514, compound

Participants

Reaction Conditions

Reaction Steps

To a solution of 7-bromo-5-(propan-2-yl)-1,5-dihydro-4H-pyrazolo[4,3-c]quinolin-4-one (0.25 g, 0.82 mmol) in 8 mL of DMF placed in a microwave reactor are added caesium carbonate (0.8 g 2.5 mmol), 4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyridine (0.25 g 1.22 mmol) and the catalyst PdCl2(dppf) (60 mg, 0.08 mmol). The reactor is sealed and the mixture is stirred for 20 minutes at 150° C. under microwave irradiation. The reaction medium is diluted with an EtOAc/THF mixture (50/50) and washed with water and then with saturated aqueous NaCl solution. The organic phase is dried over Na2SO4 and concentrated to dryness. After purification by flash chromatography (DCM/MeOH: 100/0 to 90/10), 45 mg of a white solid are obtained (yield: 19%).

Provenance & Evidence