Diisopropylethylamine → ethyl 5-(2-(ethyl(methyl)amino)-[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 N2-ethyl-N2-methyl-[1,2,4]triazolo[1,5-a]pyridine-2,7-diamine (215 mg, 1.12 mmol), 4-(ethoxycarbonyl)-1-methyl-1H-pyrazole-5-carboxylic acid (267 mg, 1.35 mmol), propylphosphonic anhydride (50% in ethyl acetate, 1.66 ml, 2.81 mmol) and N,N-diisopropylethylamine (574 μl, 3.37 mmol) in tetrahydrofuran (10 ml) was refluxed for 18 hours. The crude material was applied on silicagel and purified by flash chromatography over a 20 g silicagel column using ethyl acetate 100% as eluent affording 5-[2-(ethyl-methyl-amino)-[1,2,4]triazolo[1,5-a]pyridin-7-ylcarbamoyl]-1-methyl-1H-pyrazole-4-carboxylic acid ethyl ester (375 mg, 89.8%) as a light yellow solid. mp: 167° C., MS: m/z=372.5 (M+H+)

Provenance & Evidence