Phosphorus oxybromide → 2-(difluoro(5-fluoropyridin-2-yl)methyl)-N-(5-methyl-1H-pyrazol-3-yl)-8-(trifluoromethyl)quinazolin-4-amine

Participants

Reaction Conditions

Reaction Steps

To 2-(difluoro(5-fluoropyridin-2-yl)methyl)-8-(trifluoromethyl)quinazolin-4-ol (121 mg, 0.34 mmol) were added phosphoryl tribromide (890 mg) and toluene (1 mL) followed by DIEA (0.117 mL, 0.67 mmol). The mixture was heated at 105° C. for 1 h. The mixture was cooled and partitioned between EtOAc and saturated aq sodium bicarbonate. The organic layer was dried over sodium sulfate and concentrated under reduced pressure. To the residue was added a solution of 5-methyl-1H-pyrazol-3-amine (150 mg, 1.5 mmol) in DMF (4 mL) and the mixture was stirred at rt for 1.5 h. The crude mixture was purified by preparative HPLC (Varian diphenyl reverse phase column, eluting with a gradient of solvent B=0.05% HOAc/ACN and solvent A=0.05% HOAc/H2O) to afford 2-(difluoro(5-fluoropyridin-2-yl)methyl)-N-(5-methyl-1H-pyrazol-3-yl)-8-(trifluoromethyl)quinazolin-4-amine (30 mg, 20%). 1H NMR (300 MHz, DMSO-d6) δ ppm 2.19 (s, 3H) 6.03 (s, 1H) 7.77 (t, J=7.91 Hz, 1H) 7.96-8.06 (m, 2H) 8.27 (d, J=7.53 Hz, 1H) 8.67 (s, 1H) 8.97 (d, J=8.29 Hz, 1H) 11.00 (br s, 1H) 12.18 (br s, 1 H); LC-MS (ESI) m/z 439 (M+H)+.

Provenance & Evidence