Diisopropylethylamine → ethyl 5-(2-isopropyl-[1,2,4]triazolo[1,5-a]pyridin-7-ylcarbamoyl)-1-methyl-1H-pyrazole-4-carboxylate

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Reaction Steps

A mixture of 2-isopropyl-[1,2,4]triazolo[1,5-a]pyridin-7-amine (159 mg, 902 μmol), 4-(ethoxycarbonyl)-1-methyl-1H-pyrazole-5-carboxylic acid (215 mg, 1.08 mmol), propylphosphonic anhydride (50% in ethyl acetate, 1.33 ml, 2.26 mmol) and diisopropylethylamine (473 μl, 2.71 mmol) in tetrahydrofurane (7 ml) is refluxed for 18 hours. The solvent is evaporated and the residue stirred for 1 hr with sat. aqueous sodium hydrogencarbonate solution. The precipitated solid is collected by filtration, washed with water and dried affording ethyl 5-(2-isopropyl-[1,2,4]triazolo[1,5-a]pyridin-7-ylcarbamoyl)-1-methyl-1H-pyrazole-4-carboxylate (332 mg, 103%) as a white solid. Mp.: 175-7° C. MS: m/z=357.2 (M+H+).

Provenance & Evidence