Dimethylformamide → 2,4-Dimethylpyrazolo[1,5-a]pyrido[3,4-e]pyrimidin-5(4H)-one

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Reaction Steps

2 g. of 2-methylpyrazolo[1,5-a]pyrido[3,4-e]pyrimidin5(4H)-one are treated with 2 g. of methyl iodide in 20 ml. of dimethylformamide in the presence of 2 g. of potassium carbonate at 70° with stirring for 12 hours. The mixture is cooled to room temperature, 20 ml. of water are added and the precipitated 2,4-dimethylpyrazolo[1,5-a]pyrido[3,4-e]pyrimidin-5(4H)-one is filtered off, yield: 1.5 g. (70%); m.p. > 300° (DMF).

Provenance & Evidence