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  • 1
    ISSN: 1434-4475
    Keywords: Nucleosides, convergent synthesis of ; Uridines, 3′-azido-2′,3′-dideoxy ; Uridines, 3′-fluoro-2′,3′-dideoxy ; AZT analogues ; Human immunodeficiency virus ; Herpes simplex virus
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Aus Uracil (8) wurden in einer Mannich-Reaktion in 65–85% Ausbeute die 5-substituierten Dialkylaminomethyluracile11a–f hergestellt. Verbindungen11a–f wurden mit Hexamethyldisilazan silyliert und mit 2,3-Didesoxy-3-fluor-D-erythro-pentofuranosid (4) und 3-Azido-2,3-didesoxy-D-erythro-pentofuranosid (7) unter Verwendung von Trimethylsilyl-trifluormethansulfonat als Katalysator zu den entsprechenden 3′-Fluor-2′,3′-didesoxynucleosiden13a–f und 3′-Azido-2′,3′-didesoxynucleosiden16d, f umgesetzt. Deprotektion der 5-O-(4-Phenylbenzoyl)- geschützten Nucleoside13a–f und16d, f mit gesättigtem methanolischem Ammoniak und Trennung mittels Chromatographie ergab die neuen 2′,3′-Didesoxy-3′-fluoruridine14a–f und15a–f, sowie die 2′,3′-Didesoxy-3′-azidouridine17d, f und18d, f.
    Notes: Summary Uracil (8) was substituted in a Mannich reaction to give the 5-substituted dialkylamino-methyluracils11a–f in 65–85% yield. Compounds11a–f were silylated with hexamethyldisilazane and coupled with 2,3-dideoxy-3-fluoro-D-erythro-pentofuranoside4 and 3-azido-2,3-dideoxy-D-erythro-pentofuranoside7 to give the corresponding 3′-fluoro-2′,3′-dideoxynucleosides13a–f and 3′-azido-2′,3′-dideoxy nucleosides16d, f, respectively, by using trimethylsilyl trifluoromethanesulfonate as a catalyst. Deprotection of the 5-O-(4-phenylbenzoyl) protected nucleosides13a–f and16d, f with saturated methanolic ammonia and separation by chromatography yielded the new derivatives of 2′,3′-dideoxy-3′-fluorouridines14a–f and15a–f and 2′,3′-dideoxy-3′-azidouridines17d, f and18d, f.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Monatshefte für Chemie 122 (1991), S. 59-70 
    ISSN: 1434-4475
    Keywords: 2′,3′-Dideoxycytidines ; 2′,3′-Dideoxyuridines ; 5-Alkoxymethyluracils ; Human immunodeficiency virus
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Ausgehend vonL-Glutaminsäure (1) wird eine modifizierte Synthese von geschützter 2,3-Dideoxyribose (5) beschrieben. Reaktion von5 mit silyliertem 5-Alkoxymethyluracilen7 b–e in Gegenwart von Trimethylsilyltriflat ergab anomere Mischungen der 2′,3′-Dideoxyuridinderivate8 a–e und9 a–e. Abspaltung der Schutzgruppe mit methanolischen Ammoniak und chromatographische Trennung ergab die entsprechenden Nucleoside10 a–e und11 a–e. Behandlung von9 b–e mit Tri(1H-1,2,4-triazol-1-yl)phosphinoxid und nachfolgende Reaktion von12 b–e mit Ammoniak in Dioxan ergab die Cytosinderivate13 b–e, welche nach Behandlung mit methanolischem Ammoniak die entsprechenden 2′,3′-Dideoxycytidinderivate14 b–e und15 b–e ergaben. Im Gegensatz zur Stammverbindung hatten diese Alkoxymethylderivate keine nennenswerte Wirksamkeit gegen den menschlichen Immunschwächevirus (HIV-1).
    Notes: Summary A modified synthesis of protected 2,3-dideoxyribose5 starting fromL-glutamic acid (1) is described. Reaction of5 with silylated 5-hydroxymethyluracil7 a and 5-alkoxymethyluracils7 b–e in the presence of trimethylsilyl triflate afforded an anomeric mixture of 2′,3′-dideoxyuridine derivatives8 a–e and9 a–e. Deprotection with methanolic ammonia and separation by chromatography gave the corresponding nucleosides10 a–e and11 a–e. Treatment of9 b–e with tri(1H-1,2,4-triazol-1-yl)phosphine oxide and subsequent reaction of12 b–e with ammonia in dioxane afforded the cytosine derivatives13 b–e which on treatment with methanolic ammonia gave the corresponding 2′,3′-dideoxycytidine derivatives14 b–e and15 b–e. In contrast with the parent compounds, these alkoxymethyl derivatives had no appreciable activity against human immunodeficiency virus (HIV-1).
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1992 (1992), S. 127-129 
    ISSN: 0170-2041
    Keywords: Uridine-5′-phosphonates, 2′,5′-dideoxy- ; D-erythro-Pentofuranose-5-phosphonates, 2,5-dideoxy- ; Arbuzov reaction ; Human immunodeficiency virus ; Herpes simplex virus ; Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Methyl 2,5-dideoxy-5-iodo-3-O-pivaloyl-D-erythro-pentofur-anoside (5) was synthesized from 2-deoxy-D-ribose and treated with triethyl phosphite to give the phosphonate 6. Reaction of 6 with silylated 2,4-dihydroxypyrimidine 7 in the presence of trimethylsilyl trifluoromethanesulfonate as catalyst afforded nucleoside phosphonates 8 and 9 which were deprotected with C2H5ONa in ethanol to give the diethyl 2′,5′-dideoxyuridine-5′-phosphonate 10 and its α-anomer 11. No activity was found for the nucleosides 8-11 against HIV or HSV-1.
    Type of Medium: Electronic Resource
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