Phosphorus oxychloride → N-(2,3-difluorophenyl)-2-{4-[(7-hydroxy-5-isopropoxyquinazolin-4-yl)amino]-1H-pyrazol-1-yl}acetamide

Participants

Reaction Conditions

Reaction Steps

Phosphoryl chloride (3.7 ml, 40 mmol) was added to a solution of 5-isopropoxy-4-oxo-3,4-dihydroquinazolin-7-yl acetate (2.6 g, 10 mmol) and di-iso-propylethylamine (14 ml, 80 mmol) in 1,2-dichloroethane (75 ml) and the reaction was heated at 80° C. for 1 hour. The mixture was evaporated under reduced pressure and the residue suspended in dimethylacetamide (30 ml). 2-(4-Amino-1H-pyrazol-1-yl)-N-(2,3-difluorophenyl)acetamide (2.5 g, 10 mmol) was added and the mixture was then heated at 90° C. for 1 hour. The mixture was evaporated under reduced pressure and the residue stirred in a 7N solution of ammonia in methanol (100 ml) at ambient temperature for 2 hours. The mixture was evaporated under reduced pressure to leave a yellow solid which was stirred in water (50 ml) for 1 hour, then filtered and the residue purified by silica gel chromatography eluting with a 0 to 10% mixture of methanol in dichloromethane to give N-(2,3-difluorophenyl)-2-{4-[(7-hydroxy-5-isopropoxyquinazolin-4-yl)amino]-1H-pyrazol-1-yl}acetamide (2.7 g, 60% yield):

Provenance & Evidence