Potassium Phosphate, Tribasic → HCID 136359761, compound

Participants

Reaction Conditions

Reaction Steps

To a solution of 7-bromo-1-{[2-(trimethylsilyl)ethoxy]methyl}-1,5-dihydro-4H-pyrazolo[4,3-c]quinolin-4-one and 7-bromo-2-{[2-(trimethylsilyl)ethoxy]methyl}-1,5-dihydro-4H-pyrazolo[4,3-c]quinolin-4-one [described in Step 3.1] (18.2 g, 46.2 mmol) in 150 mL of DMF placed in a microwave reactor are successively added 4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyridine (11.4 g, 55.4 mmol), aqueous 2M K3PO4 solution (47 mL, 92.4 mmol) and the catalyst PdCl2(dppf) (1.88 g, 2.31 mmol) under nitrogen. The reactor is sealed and the reaction mixture is stirred for 20 minutes at 150° C. under microwave irradiation. After concentrating the reaction mixture, purification by flash chromatography on silica (DCM/MeOH: 0/100 to 95/5) gives 12.4 g of 7-(pyrid-4-yl)-1-[2-(trimethylsilyl)ethoxy]-1,5-dihydro-4H-pyrazolo[4,3-c]quinolin-4-one and 7-(pyrid-4-yl)-2-[2-(trimethylsilyl)ethoxy]-1,5-dihydro-4H-pyrazolo[4,3-c]quinolin-4-one in the form of a white solid (yield: 54%).

Provenance & Evidence