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  • 1985-1989  (4)
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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: Glycosylierungen von Pyrazino[2,3-c]-1,2,6-thiadiazin-2,2-dioxiden zu Schwefeldioxid-Analogen von Pteridin-NucleosidenDie Pyrazino[2,3-c]-1,2,6-thiadiazin-2,2-dioxide 1, 2 und 3 werden als Trimethylsilyl-Derivate mit 1-O-Acetylribose-Derivaten glycosyliert. 1 liefert ein Gemisch der N-1- und N-8-Monoriboside sowie das N-1,4-N-Diribosid, wobei die Produktverteilung von den Reaktionsbedingungen abhängt. Mit den 6,7-disubstituierten Pyrazino[2,3-c]-1,2,6-thiadiazinen 2 und 3 werden lediglich die N-1-Monoriboside gebildet. Die Strukturen der neu synthetisierten Verbindungen werden auf der Basis der UV-, 1H-NMR- und 2D-NMR-Spektren diskutiert und gesichert.
    Notes: Pyrazino[2,3-c]-1,2,6-thiadiazine 2,2-dioxides 1, 2, and 3 have been glycosylated as their trimethylsilyl derivatives with 1-O-acetyl derivatives of ribose. 1 leads to mixtures of N-1 and N-8 monoribosides and N-1,4-N diribosides, the relative proportions depending on the reaction conditions used. However, in the case of 6,7-disubstituted pyrazinothiadiazines 2 and 3 only the N-1 monoribosides have been obtained. The structures of the newly synthesized compounds are discussed on the basis of UV, 1H NMR and 2D homonuclear NMR data.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Untersuchung der Rotationsisomerie und Synthese von Pyrazino[2,3-c][1,2,6]thiadiazin-2,2-dioxid-GlucosidenGlucosidierungen des 4-Amino-8H-pyrazino[2,3-c][1,2,6]thiadiazin-2,2-dioxids und seiner 6,7-Dimethyl- und 6,7-Diphenyl-Derivate mit Hilfe der „Silyl-Methode“ Werden beschrieben. Die Reaktion führt bevorzugt zu N-1-Substitution. Die entsprechenden Tetra-O-acetylglucopyranosyl-Derivate 5, 6 und 7 sowie die freien Nucleoside 8, 9 und 10 wurden isoliert und durch UV-, 1H- und 2D-NMR-Spektroskopie charakterisiert. Die freien Nucleoside liegen bei Raumtemperatur als rotationsgehinderte „syn/anti“-Isomere vor. Die freien Energien der Aktivierung wurden berechnet.
    Notes: Glucosidations of 4-amino-8H-pyrazino[2,3-c][1,2,6]thiadiazine 2,2-dioxide and its 6,7-dimethyl- and 6,7-diphenyl derivatives via the “silylation method” are described. The reaction favors N-1 substitution and the tetra-O-acetylglucopyranosyl derivatives 5, 6, and 7 as well as the free nucleosides 8, 9, and 10 have been isolated and characterized by UV, 1H, and 2D-NMR spectroscopy. The latter compound exist at room temperature, as rotationally restricted “syn-anti” isomers, and the free energies of activation have been calculated.
    Additional Material: 3 Tab.
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  • 3
    Electronic Resource
    Electronic Resource
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 23 (1985), S. 1082-1083 
    ISSN: 0749-1581
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The computer-assisted analysis data of t1H NMR spectra of peracetylated α-and β-1 →3- and -1 → 4-linked D-gal-actopyranosyl-D-galactopyranoses and several tetraacetylatedO-methyl derivatives of D-galactopyranose are reported.
    Additional Material: 4 Tab.
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  • 4
    Electronic Resource
    Electronic Resource
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 24 (1986), S. 444-450 
    ISSN: 0749-1581
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The natural abundance 15N NMR spectra of sulphamide, sixteen 1,2,6-thiadiazine and two 1,2,4,6-thiatriazine derivatives, phenylbutazone and antipyrine have been recorded for the first time. The influence of substituents on nitrogen chemical shifts and the effect of intercalation of SO2 and CO groups between two nitrogen atoms are discussed. Prototropic tautomerism was also studied. 13C NMR data for some of the 1,2,6-thiadiazine and thiatriazine derivatives are reported.
    Additional Material: 2 Ill.
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