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  • Organic Chemistry  (2)
  • Wiley-Blackwell  (2)
  • 1980-1984  (2)
  • 1970-1974
  • 1935-1939
  • 1981  (2)
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Keywords
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  • Wiley-Blackwell  (2)
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  • 1980-1984  (2)
  • 1970-1974
  • 1935-1939
Year
  • 1
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Ring Closures of syn-(E)- and (E)-(2-Quinolylmethyl)- and -(1-Isoquinolylmethyl)ketoximes to Pyrazolo[1,5-a]quinolines and Pyrazolo[5,1-a]isoquinolinesThe (2-quinolylmethyl)- and (1-isoquinolylmethyl)ketoximes 2a -e and 4a -d have been prepared and the oxime configurations determined. The Pyrazolo[1,5-a]quinolines 7a, b and the pyrazolo[5,1-a]isoquinoline 8a are formed by Beckmann reaction of the anti-isomers 2a, b and 4a, while O mesitylsulfonylhydroxylamine yields the pyrazolo compounds 7 and 8, independent of the oxime configuration.
    Notes: Die (2-Chinolylmethyl)- und (1-Isochinolylmethyl)ketoxime 2a-e und 4a-d wurden synthetisiert und die Oximkonfigurationen ermittelt. Durch Beckmann-Reaktion entstehen aus den anti-Isomeren 2a, b und 4a die Pyrazolo[1,5-a]chinoline 7a, b bzw. das Pyrazolo[5,1-a]isochinolin 8a, während mit O-Mesitylsulfonylhydroxylamin die Pyrazoloverbindungen 7 und 8 unabhängig von der Oximkonfiguration entstehen.
    Additional Material: 6 Tab.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 323 (1981), S. 747-754 
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Protected Aminooxazolines of Arabinose and RiboseThe reaction of D-arabinose or D-ribose with cyanamide afforded 2-amino-1,2-oxazolines 1 which were treated with dihydropyran or ethylvinylether. In the presence of PTS the 3′,5′-di-THP- or 3′,5′-di-O-ethoxyethyl-D-arabino-(ribo)-furo-[1′,2′:4,5]-2-oxazolines 2 and 3 could be isolated as useful intermediates for the preparation of nucleosides.When the 2-aminooxazolines are treated with benzyloxycarbonylchloride or its p-substituted derivatives the N-3 atom of the oxazoline ring is preferentially substituted. Under these conditions the exocyclic amino function is always replaced and 2-oxo-3-benzyloxycarbonylderivatives 4 are obtained; only traces of the corresponding 2-aminoderivatives 5 are formed. Treatment of 4 with acetic anhydride, benzoylchloride, and benzoylcyanide, respectively, results in the 3′-, 5′-di-O-acyl derivatives 6. Mild hydrolysis of the benzyloxycarbonyl group with trifluoroacetic acid yields the 3′,5′-di-O-acyl-D-arabino-(ribo)-furo-[1′,2′:4,5]-2-oxooxazolidines as further intermediates for the synthesis of nucleosides.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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