p-Toluenesulfonic acid → 5-(1-acetyl-1H-indazol-5-yl)-2-(pyridin-2-yl)-4H,7H-[1,2,4]triazolo[1,5-a]pyrimidin-7-one

Participants

Reaction Conditions

Reaction Steps

To a solution of 3-(pyridin-2-yl)-1H-1,2,4-triazol-5-amine (150 mg, 0.93 mmol) in diphenyl ether (3 mL) was added ethyl 3-(1-acetyl-1H-indazol-5-yl)-3-oxopropanoate (510 mg, 1.86 mmol) and TsOH (8 mg, 0.05 mmol), and the mixture was stirred for 1 h at 170° C. The resulting solution was diluted with n-hexane (8 ml), and the product was collected by filtration and washed with methanol (2 ml) to afford 5-(1-acetyl-1H-indazol-5-yl)-2-(pyridin-2-yl)-4H,7H-[1,2,4]triazolo[1,5-α]pyrimidin-7-one as a brown crude solid (120 mg, crude).

Provenance & Evidence