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  • Inorganic Chemistry  (36)
  • Organic Chemistry  (32)
  • Carbohydrates  (2)
  • 17β-Marsdenin  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 104 (1971), S. 665-667 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 104 (1971), S. 1147-1154 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Influences of Configuration, Conformation, and Subtituents on the 13C Chemical Shifts in Glycosides 6. Mitteil. über Fourier-Transform-13C-NMR-Spektroskopie: 5. Mitteil.: W. Voelter, G. Jung, E. Breitmaier und E. Bayer, Z. Naturforsch. 1971, im Druck.The pulse Fourier transform 13C n.m.r. spectra of 20 methyl and aryl glycosides are discussed. Configurational and conformational assignments can be made using the 13C chemical shifts of these compounds. Anomeric glycosides can be easily distinguished following this method.
    Notes: Die Impuls-Fourier-Transform-13C-NMR-Spektren von 20 Methyl- und Arylglykosiden werden diskutiert. Ihre Konfiguration und Konformation kann aus den 13C-chemischen Verschiebungen zugeordnet werden. Auch anomere Glykoside lassen sich auf diese Weise leicht unterscheiden.
    Additional Material: 3 Ill.
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 108 (1975), S. 862-874 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Four Routes for the Synthesis of (2-Pyrimidinylamino)-n-alkanoic AcidsNucleotide analogues of amino acids with variously substituted 2-pyrimidinyl side chains are available by four synthetic routes. 1) The cyclocondensation of 2-alkyl-3-aminoacroleins (4) with amino acids containing guanidino functions (5b) gives Nδ-(5-alkyl-2-pyrimidinyl)ornithine derivatives (7). 2) Cyclocondensations of 1,3-diketones of (9) with C-(guanidino)amino acids or N-(amidino)amino acids (5a-d) yield (4,6-dialkyl-2-pyrimidinylamino)-n-alkanoic acids (10). 3) (4-Alkyl-6-oxo-1,6-dihydro-2-pyrimidinylamino)-n-alkanoic acids (13) are obtained by way of cyclocondensation of ethyl acetoacetate (12) with 5a-c. 4) The nucleophilic substitution of 2-ethylthio-6-oxo-1,6-dihydropyrimidines (14, 17) by mono- and diamino acids (15) yields (5-alkyl-6-oxo-1,6-dihydro-2-pyrimidinylamino)- and (4-alkyl-6-oxo-1,6-dihydro-2-pyrimidinylamino)-n-alkanoic acids (16, 18).
    Notes: Nucleotid-analoge Aminosäuren mit verschieden substituierten 2-Pyrimidinyl-Seitenketten sind auf vier Wegen zugänglich: Die Cyclokondensation von 2-Alkyl-3-aminoacroleinen (4) mit Aminosäuren mit Guanidinofunktion (5b) führt zu Nδ-(5-Alkyl-2-pyrimidinyl)ornithin-Derivaten (7). Cyclokondensationen von 1,3-Diketonen (9) mit C-(Guanidino)aminosäuren bzw. N-(Amidino)aminosäuren (5a-d) liefern (4,6-Dialkyl-2-pyrimidinyiamino)-n-alkansäuren (10). Durch Cyclokondensationen von Acetessigester (12) mit 5a-c sind (4-Alkyl-6-oxo-1,6-dihydro-2-pyrimidinylamino)-n-alkansäuren (13) darstellbar. Aus 2-Äthylthio-6-oxo-1,6-dihydropyrimidinen (14, 17) lassen sich durch nucleophile Substitution mit Mono- und Diaminosäuren (15) (5-Alkyl-6-oxo-1,6-dihydro-2-pyrimidinylamino)- sowie (4-Alkyl-6-oxo-1,6-dihydro-2-pyrimidinylamino)-n-alkansäuren (16, 18) erhalten.
    Additional Material: 1 Ill.
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  • 4
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 107 (1974), S. 2537-2543 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Synthesis of 6-(Pyrido[2,3-d]pyrimidin-8-yl)hexanoic AcidsBy way of nucleophilic substitution, 4-chlorouracil (8) reacts with 6-aminohexanoic acids (9,10) to yield 6-(4-pyrimidinylamino)hexanoic acids (4,5). These undergo cyclocondensation with 3-amonoacroleins and 2-(hydroxymethylene)cycloalkanones (2), respectively, to yield 6-(pyrido[2,3-d]pyrimidin-8-yl)hexanoic acids (6,7). The 1H and 13C n. m. r. spectra of these carboxylic acids substituted with heterocycles are discussed.
    Notes: Aus 4-Chloruracil (8) und 6-Aminohexansäuren (9,10) entstehen durch nucleophile Substitution 6-(4-Pyrimidinylamino)hexansäuren (4,5). Diese cyclokondensieren mit 3-Aminoacroleinen bzw. 2-(Hydroxymethylen)cycloalkanonen (2) zu 6-(Pyrido[2,3-d]pyrimidin-8-yl)-hexansäuren (6,7). Die 1H- und 13C-NMR-Spektren dieser heterocyclisch substituierten Carbonsäuren werden diskutiert.
    Additional Material: 2 Tab.
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  • 5
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 108 (1975), S. 1111-1117 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Synthesis of Optically Active α-Amino Acids Substituted in the Side Chain with an 8-Azapurinyl Residue4-Amino-6-chloro-5-nitropyrimidine (1) or 4-chloro-5-nitro-6-oxo-1,6-dihydropyrimidine (4) react with Nα-benzyloxycarbonyl-L-lysine (2a) or 6-aminohexanoic acid (2b) to give 6-(4-pyrimidinyl-amino)hexanoic acids (3a, b, 5a, b). Reduction of their nitro group and subsequent cyclization with sodium nitrite in acidic medium yields the corresponding (triazolo[4,5-d]pyrimidine-3-yl)hexanoic acid derivatives (7a, b, 9a, b). The amino acid derivatives 7a and 9a are hydrogenated to optically active 8-azapurinyl substituted α-amino acids (10, 11).
    Notes: Durch Umsetzung von 4-Amino-6-chlor-5-nitropyrimidin (1) bzw. 4-Chlor-5-nitro-6-oxo-1,6-dihydropyrimidin (4) mit Nα-Benzyloxycarbonyl-L-lysin (2a) bzw. 6-Aminohexansäure (2b) lassen sich 6-(5-Nitro-4-pyrimidinylamino)hexansäuren (3a, b, 5a, b) darstellen. Nach Reduktion der Nitrogruppe mit Natriumdithionit werden diese mit Natriumnitrit in essigsaurem Medium zu (Triazolo[4,5-d]pyrimidin-3-yl)hexansäure-Derivaten (7a, b, 9a, b) cyclisiert. Die Aminosäure-derivate 7a und 9a können zu optisch aktiven, 8-azapurinyl-substituierten α-Aminosäuren (10, 11) hydriert werden.
    Additional Material: 1 Ill.
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  • 6
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 110 (1977), S. 3111-3117 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Monoterpenoid Glucosides from the Leaves of Betula alba and the Fruits of Chaenomeles japonicaTwo stereoisomeric monoterpenoid glycosides, betulalbuside A and B (3a and 4a), were isolated from the leaves of Betula alba (Betulaceae) and from the fruits of Chaenomeles japonica (Rosaceae). By spectroscopic methods their constitutions were shown to be 9-hydroxylinalool 9- and 1-hydroxylinalool 1-β-D-glucopyranoside, respectively.
    Notes: Aus Birkenblättern, Betula alba (Betulaceae), und den Früchten von Chaenomeles japonica (Rosaceae) wurden zwei stereoisomere Monoterpen-Glycoside Betulalbusid A und B (3a und 4a) isoliert. Ihre Konstitutionen konnten vorwiegend spektroskopisch als 9-Hydroxylinalool-9- bzw. 1-Hydroxylinalool-1-β-D-glucopyranosid ermittelt werden.
    Additional Material: 3 Ill.
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  • 7
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 111 (1978), S. 2003-2009 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The Reaction of β-Aminovinylcarbonyl Compounds with DiphenylcarbodiimideThe cyclization of 3-amino-2-alkylpropenals 1 with diphenylcarbodiimide (2) yields 5-alkyl-1-phenylpyrimidin-2(1H)-phenylimines 4. No corresponding reaction is observed with dicyclo-hexylcarbodiimide. 4-Amino-3-penten-2-one (5) reacts with diphenylcarbodiimide (2) as a CH acidic compound, i.e. involving addition to 4-amino-3-(N,N′-diphenylamidino)-3-penten-2-one (7). The corresponding addition to ethyl β-aminocrotonate (6) is observed to give 8. The constitution of the products 4, 7, and 8 is in accordance with the IR-, 1H- and 13C NMR spectra.
    Notes: 3-Amino-2-alkylpropenale 1 cyclisieren mit Diphenylcarbodiimid (2) zu 5-Alkyl-1-phenyl-pyrimidin-2(1H)-phenyliminen 4. Mit Dicyclohexylcarbodiimid wird keine entsprechende Reaktion beobachtet. 4-Amino-3-penten-2-on (5) reagiert mit Diphenylcarbodiimid (2) wie eine CH-acide Verbindung, d. h. unter Addition zu 4-Amino-3-(N,N′-diphenylamidino)-3-penten-2-on (7). Die entsprechende Addition zu 8 wird auch für β-Aminocrotonsäure-ethylester (6) beobachtet. Die Konstitution der Verbindungen 4, 7 und 8 stimmt mit den IR-, 1H- und 13C-NMR-Spektren überein.
    Additional Material: 2 Tab.
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  • 8
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 102 (1969), S. 728-735 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Aromatische 1.2-Diketone kondensieren mit 2-Amino-thiophenol im Verhältnis 1:1 unter Bildung von 2-Aryl-2-aroyl-benzothiazolinen. Diese reagieren in Eisessig unter β-Eliminierung aromatischer Aldehyde zu 2-Aryl-benzothiazolen, in alkoholischer Natronlauge mit Cadmium(II)-acetat zu Bis-[aril-mono-(2-mercapto-anil)]-cadmium-Chelaten.
    Additional Material: 2 Ill.
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  • 9
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 106 (1973), S. 1736-1742 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Synthesis of Cycloalkeno[b]pyridines from 2-(Aminomethylene)cycloalkanones and 1,3-Dicarbonyl Compounds2-(Aminomethylene)cycloalkanones react with 1,3-dicarbonyl compounds to give the cycloalkeno[b]pyridines 4-7, the 1H and 13C n.m.r. spectra of which are discussed. The chemical shift values of the heteroaromatic bridge-head carbon atoms are found to alternate on variation of the fused cycloaliphatic ring.
    Notes: Aus 2-(Aminomethylen)cycloalkanonen und 1,3-Dicarbonylverbnidungen werden die Cycloalkeno[b]pyridine 4-7 dargestellt, deren 1H- und 13C-NMR-Spektren diskutiert werden. Die chemischen Verschiebungen der heteroaromatischen Brückenkopf-Kohlenstoffatome alternieren bei Variation des ankondensierten Cycloaliphaten.
    Additional Material: 3 Ill.
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  • 10
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 111 (1978), S. 1646-1649 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Note to the Constitution of Meisenheimer and Zimmermann CompoundsThe 13C NMR spectra of Meisenheimer and Zimmermann salts with the polynitrophenylacetone backbone are assigned by means of shift increments and selective proton decoupling. The data illustrate that 13C chemical shifts and coupling constants reflect the binding state of carbon in and adjacent to aromatic and quinoid systems.
    Additional Material: 2 Tab.
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