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DMF Acetals as Alkylating and Cyclizing Agents: A Facile Route to Substituted Pyrazolo[3,4-d]pyrimidine-4,6(5H,7H)-diones
Youssif
, p. 493 - 501 (2007/10/03)
Several 7-methyl-5-alkyl-2-vinylpyrazolo[3,4-d]pyrimidine-4,6(5H,7H)-diones were prepared. The successful cyclization and alkylation of 6-(α-methylbenzylidenehydrazino)-1-methyluracils 2a-d using dimethylformamide acetals at high temperature provided 6a-d, 7a-d, and 8a-d. Treatment of 6a-d and 7a-d with acid afforded 7-methyl-5-alkylpyrazolo[3,4-d]pyrimidine-4,6(5H,7H)-diones 9a, b; under the same conditions, 3a-d reacted to 7-methylpyrazolo[3,4-d]-pyrimidine-4,6(5H)-dione (4) in good yield.
