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  • 1
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Reaktionen von Uracilen, 4. - Einige Aspekte der Chemie von Pyrido[2,3-d]pyrimidinen. Ein neues s-Triazolo[4′, 3′ : 1,6]pyrido[2,3-d]pyrimidinAus dem neuen 7-Hydrazino-1,3-dimethylpyrido[2,3-d]pyrimidin-2,4(1H,3H)-dion (2) werden die Hydrazinderivate 3, 5, 6, 8 und 10 dargestellt. Aus 3 wird das s-Triazolo[4′,3′: 1,6]pyrido-[2,3-d]pyrimidin 4 erhalten, während Ringschlußversuche von 5, 6 und 8 erfolglos blieben. Zwei 6-substituierte Pyrido[2,3-d]pyrimidine werden hergestellt, 13a aus 11 und Benzoylacetonitril, 16 durch Photo-Fries-Umlagerung von 15. In CDCl3-Lösung und in fester Phase überwiegt die tautomere OH-Form 161.
    Notes: The novel 7-hydrazino-1,3-dimethylpyrido[2,3-d]pyrimidine-2,4(1H,3H)-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 CDCl3 solution and in solid phase predominates the tautomeric OH form 161.
    Type of Medium: Electronic Resource
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