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  • Nucleoside synthesis  (2)
  • 2-(5-triazeno)pyrazole; Human immunodeficiency virus; Herpes simplex virus.  (1)
  • 3′  (1)
  • 1
    ISSN: 1434-4475
    Keywords: 3′-Azido-2′,3′-dideoxy-2-thiouridines ; 5-Alkoxy-2-thiouracils ; Nucleoside synthesis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Die Reaktion von 3-Azido-5-O-tert-butyldiphenylsilyl-2,3-dideoxy-D-erythro-pentofuranosid (5) mit silyliertem 2-Thiouracil und 5-Alkoxy-2-thiouracil in Gegenwart von Trimethylsilyltrifluormethansulfonat ergab eine anomere Mischung der entsprechenden 3′-Azido-2′,3′-dideoxy-2-thiouridin-Derivate, wobei das α-Anomer das Hauptprodukt darstellte. Die ungeschützten Nucleoside wurden mittels Behandlung mit Tetrabutylammoniumfluorid erhalten.
    Notes: Summary Reaction of 3-azido-5-O-tert-butyldiphenylsilyl-2,3-dideoxy-D-erythro-pentofuranoside (5) with silylated 2-thiouracil and 5-alkoxy-2-thiouracils in the presence of trimethylsilyl trifluoromethanesulfonate afforded an anomeric mixture of the corresponding 3′-azido-2′,3′-dideoxy-2-thiouridine derivatives with the α-anomer as the main product. Deprotected nucleosides were obtained by treatment with tetrabutylammonium fluoride.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1434-4475
    Keywords: Keywords. Nucleosides ; convergent synthesis of; Nucleosides ; 3′-azido-2′-deoxy; Nucleosides ; 2′ ; 3′-didehydro; Nucleosides ; 3′ ; 4′-didehydro; 5-Alkoxymethyluracil nucleosides; Human immunodeficiency virus; Herpes simplex virus.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung.  Reaktion von Methyl-5-tert-butyldiphenylsilyl-2,3-dideoxy-3-iodo-D-threo-pentofuranosid (3) mit den silylierten 5-Alkoxymethyluracilen 2a–c unter Verwendung von Trimethylsilyltrifluormethansulfonat als Katalysator ergab die α-Nucleoside 4a–c und die β-Nucleoside 5a–c. Die entsprechenden 3′,4′- und 4′,5′-Didehydronucleoside 6–9 wurden durch Behandeln der Jodnucleoside 4a–c oder 5a–c mit 10 Äquivalenten Natriummethoxid in siedendem Methanol über eine Eliminierungsreaktion hergestell. Die entschützten 3′-Azidonucleoside 10a–c und 11a–c vom AZT-Typ wurden ebenso wie die 4′,5′-Didehydronucleoside 7a–c und 9a–c durch Umsetzung von 4a–c und 5a–c mit Natriumazid und nachfolgender Behandlung mit Tetrabutylammoniumfluorid erhalten.
    Notes: Summary.  Reaction of methyl 5-tert-butyldiphenylsilyl-2,3-dideoxy-3-iodo-D-threo-pentofuranoside (3) with silylated 5-alkoxymethyluracils 2a–c using trimethylsilyl trifluoromethanesulfonate as a catalyst afforded the α nucleosides 4a–c and the β nucleosides 5a–c. The corresponding 3′,4′- and 4′,5′-didehydro nucleosides 6–9 were prepared in an elimination reaction by treating the iodo nucleosides 4a–c or 5a–c with 10 equivalents of sodium methoxide in methanol under reflux. The deprotected 3′-azido nucleosides 10a–c and 11a–c of the AZT type as well as the 4′,5′-didehydro nucleosides 7a–c and 9a–c were prepared by treating 4a–c and 5a–c, respectively, with sodium azide and subsequently with tetrabutylammonium fluoride.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Monatshefte für Chemie 130 (1999), S. 1167-1173 
    ISSN: 1434-4475
    Keywords: Keywords. Triazenopyrazoles; Nucleosides ; convergent synthesis of; Nucleosides ; 1-(5-triazeno)pyrazole; Nucleosides ; 2-(5-triazeno)pyrazole; Human immunodeficiency virus; Herpes simplex virus.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung.  Ethoxymethylenmalonitril und Bis(methlthio)methylenmalonitril wurden mit Hydrazinhydrat zu 5-Aminopyrazol-4-carbonitril (3a) und 5-Amino-3-methyltiopyrazol-4-carbonitril (3b) umgesetzt. Behandlung mit salpetriger Säure und Kupplung mit verschiedenen sekundären Aminen ergab die Triazenopyrazole 4a–j. 5-(3,3-Diethyl-1-triazeno)pyrazol-4-carbonitril (4c) wurde in seine beiden regioisomeren 2-Deoxyribonucleoside 5a,bübergeführt, welche anschließend mit H2O2/OH− zu den entsprechenden Carboxamiden 6a,b hydrolysiert wurden. Alle hergestellten Verbindungen wurden auf ihre biologische Aktivität gegenüber HIV-1 und Herpes simplex getestet. Nur 4c zeigte geringfügige Aktivität gegenüber HIV-1 (ED 50=32μM).
    Notes: Summary.  Ethoxymethylenemalononitrile and bis(methylthio)methylenemalononitrile were condensed with hydrazine hydrate to yield 5-aminopyrazole-4-carbonitrile (3a) and 5-amino-3-methylthiopyrazole-4-carbonitrile (3b), respectively. These compounds were treated with nitrous acid and coupled with different secondary amines to yield the triazenopyrazoles 4a–j. 5-(3,3-Diethyl-1-triazeno)pyrazole-4-carbonitrile (4c) was transferred into its two regioisomeric 2-deoxyribose nucleosides 5a,b which were subsequently hydrolyzed with H2O2/OH− to give the corresponding carboxamides 6a,b. All synthesized compounds were tested for biological activity against HIV-1 and herpes simplex virus, but only 4c showed moderate activity against HIV-1 with ED 50=32μM.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1991 (1991), S. 1041-1044 
    ISSN: 0170-2041
    Keywords: Thymidine, 3′-deoxy-3′-(3-hydroxypropyl)- ; Nucleoside synthesis ; Carbohydrates, branched ; Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Free radicals generated by reaction of protected methyl 2,3- dideoxy-3-iodopentofuranosides 2, 3, and 9 with tributyltin hydride in the presence of a radical initiator (AIBN) were treated with acrolein to give methyl 2,3-dideoxy-3-(3-oxopropyl)pentofuranosides 4 and 5. Reduction of 5 with Sodium borohydride followed by protection of hydroxy groups by reaction with tert-butyl chlorodiphenylsilane gave the carbohydrate derivative 11 which was condensed with silylated thymine to afford a separable mixture of α- and β-nucleosides 13 and 14. These nucleosides were subsequently deprotected to give the 3′-propyl-extended thymidine 16 and its corresponding α-isomer 15.
    Type of Medium: Electronic Resource
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