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  • 1
    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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  • 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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