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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 106 (1973), S. 3743-3752 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Syntheses in the Heterocyclic Series, XVIII. Synthesis of Pyrimido[4,5-d]pyrimidine4-Amino-5-pyrimidinecarbaldehyde dimethyl acetal (2a) as well as its 2-methyl (2b) and 2-phenyl derivative (2c) react with equimolar amounts of s-triazine in the heat to give the 4-(4-amino-5-pyrimidinylmethyleneamino)-5-pyrimidinecarbaldehyde dimethyl acetals 3a-c. With an excess of 5 moles of s-triazine 2a and c react after melting to yield the pyrimido[4,5-d]-pyrimidines 4a and c; under the same conditions 2b reacts to afford 4-(aminomethyleneamino)-2-methyl-5-pyrimidinecarbaldehyde (7). With an excess of 3 moles of s-triazine 2a and b react in the heat to give the 4-methoxy-3,4-dihydropyrimido[4,5-d]pyrimidines 8a and b.
    Notes: Aus molaren Mengen 4-Amino-5-pyrimidincarbaldehyd-dimethylacetal (2a) sowie dessen 2-Methyl- (2b) und 2-Phenyl-Derivat (2c) und s-Triazin entstehen in der Hitze die 4-(4-Amino-5-pyrimidinylmethylenamino)-5-pyrimidincarbaldehyd-dimethylacetale 3a-c. Mit einem 5-molaren Überschuß an s-Triazin erhält man nach einer Schmelzreaktion mit 2a und c die Pyrimido[4,5-d]pyrimidine 4a und c und mit 2b den 4-(Aminomethylenamino)-2-methyl-5-pyrimidincarbaldehyd (7). Mit einem 3-molaren s-Triazin-Überschuß entstehen in der Hitze mit 2a und b die 4-Methoxy-3,4-dihydropyrimido[4,5-d]pyrimidine 8a und b.
    Type of Medium: Electronic Resource
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