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  • 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
    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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