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

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Reaction Steps

A mixture of 2-morpholin-4-yl-[1,2,4]triazolo[1,5-a]pyridin-6-amine (225 mg, 1.03 mmol), 4-(ethoxycarbonyl)-1-methyl-1H-pyrazole-5-carboxylic acid (224 mg, 1.13 mmol), propylphosphonic anhydride in ethyl acetate 50% (1.63 g, 1.51 ml, 2.57 mmol) and N,N-diisopropylethylamine (398 mg, 524 μl, 3.08 mmol) in tetrahydrofuran (7 ml) was refluxed for 18 hours. The solvent was evaporated, the residue was triturated with saturated aqueous sodium hydrogen carbonate. The precipitated solid was filtered off, washed with water and dried in vacuo, affording 1-methyl-5-(2-morpholin-4-yl-[1,2,4]triazolo[1,5-a]pyridin-6-ylcarbamoyl)-1H-pyrazole-4-carboxylic acid ethyl ester (292 mg, 71%) as light brown solid. Mp.: 233.5° C. MS: m/z=400.1 (M+H+).

Provenance & Evidence