1,1'-Carbonyldiimidazole → 1-(2-ethoxyethyl)-3-ethyl-1H-pyrazolo[4,3-d]pyrimidine-5,7(4H,6H)-dione

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A mixture of 4-amino-1-(2-ethoxyethyl)-3-ethyl-1H-pyrazole-5-carboxamide from step 2 (2.44 g, 10.8 mmol) in N,N-dimethylformamide (40 mL) was treated with carbonyldiimidazole (1.92 g, 11.9 mmol) and heated at 80° C. overnight. The mixture was concentrated in vacuuo and the residue was purified by column chromatography on silica gel using a mixture of ethyl acetate and hexane as the eluent to provide 1.04 g of the title compound. MS (ESI) m/z 253.

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