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Reactions of Uracils, Some Aspects of the Chemistry of Pyrido[2,3-d]pyrimidines. A Novels-Triazolo[4′,3′:1,6]pyrido[2,3-d]pyrimidine

✍ Scribed by Mátyus, Péter ;Sohár, Pál ;Wamhoff, Heinrich

Publisher: John Wiley and Sons
Year: 1984
Tongue: English
Weight: 453 KB
Volume: 1984
Category: Article
ISSN: 0947-3440
DOI: 10.1002/jlac.198419841005

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✦ Synopsis

Abstract

The novel 7‐hydrazino‐1,3‐dimethylpyrido[2,3‐d]pyrimidine‐2,4(1__H__,3__H__)‐dione (2) gives the hydrazine derivatives 3, 5, 6, 8, and 10. The s‐triazolo[4′,3′: 1,6]pyrido[2,3‐d]pyrimidine 4 is prepared from 3, while the attempted cyclizations of 5, 6, and 8 failed. Two pyrido[2,3‐d]pyrimidines substituted in position 6 are prepared, 13a from 11 and benzoylacetonitrile, 16 by photo‐Fries rearrangement of 15. In CDCl~3~ solution and in solid phase predominates the tautomeric OH form 161.

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