Ethyl Acetate → 1-methyl-5-(2-pyridin-3-yl-[1,2,4]triazolo[1,5-a]pyridin-6-ylcarbamoyl)-1H-pyrazole-4-carboxylic acid ethyl ester

Participants

Reaction Conditions

Reaction Steps

A mixture of 2-(pyridin-3-yl)-[1,2,4]triazolo[1,5-a]pyridin-6-ylamine (480 mg, 2.27 mmol), 4-(ethoxycarbonyl)-1-methyl-1H-pyrazole-5-carboxylic acid (495 mg, 2.5 mmol), propylphosphonic anhydride in ethyl acetate 50% (3.62 g, 3.35 ml, 5.68 mmol) and N,N-diisopropylethylamine (1.17 g, 1.55 ml, 9.09 mmol) in tetrahydrofuran (10 ml) was stirred for 18 hours at 70° C. The solvent was evaporated under reduced pressure, the residue was triturated with saturated aqueous sodium hydrogencarbonate. The precipitated solid was filtered off, washed with water and dried in vacuo, affording 1-methyl-5-(2-pyridin-3-yl-[1,2,4]triazolo[1,5-a]pyridin-6-ylcarbamoyl)-1H-pyrazole-4-carboxylic acid ethyl ester (825 mg, 93%) as light brown solid. Mp.: 217° C. MS: m/z=392.1 (M+H+).

Provenance & Evidence