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2004
Fused pyrimidine derivatives
R 0515
Synthesis of Trifluoromethylated Pyrido[2,3-d]pyrimidine-2,4-diones from
and Trifluoromethylated Pyrazolo[3,4-b]pyridines from
51- 131 6-Aminouracils
5-Aminopyrazoles. — A variety of trifluoromethylated pyridopyrimidine-2,4-diones
[cf. (III), (V), (VI), (VIII), (X)] and pyrazolopyridines [cf. (XII), (XIII), (XIV), (XVI)]
are synthesized by cyclocondensation reactions of 6-aminouracil (I) or 5-aminopyrazole (XI) with bifunctional compounds such as 1,3-dicarbonyls or α,β-unsaturated
ketones. — (TAKAHASHI*, M.; NAGAOKA, H.; INOUE, K.; J. Heterocycl. Chem.
41 (2004) 4, 525-530; Dep. Mater. Sci., Fac. Eng., Ibaraki Univ., Hitachi, Ibaraki 316,
Japan; Eng.) — R. Staver
2004
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