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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
    ISSN: 0947-3440
    Keywords: Nucleosides ; HIV ; 3′-Fluoronucleosides ; FLT analogues ; Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 2,4(1H,3H)-Quinazolinediones 3a-c, lumazine (3d) and thieno[2,3-d]pyrimidine-2,4(1H,3H)-dione (8) were silylated and condensed with methyl 2,3-dideoxy-3-fluoro-5-O-(4-phenylbenzoyl)-β-D-erythro-pentofuranoside (2) by using trimethylsilyl triflate as a catalyst to afford the corresponding cyclic nucleosides 4 and 9 and acyclic nucleosides 5 and 10. Removal of the protecting group from the glycon moiety was achieved in good yields by treatment with sodium methoxide in methanol at room temperature. The new FLT analogues were devoid of activity against HIV-1 and HSV-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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  • 4
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1993 (1993), S. 1-5 
    ISSN: 0170-2041
    Keywords: Carbohydrates ; Nucleosides ; Glycosides ; Uracils ; Arabinose ; Thiouracils ; Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The reaction of silylated 6-substituted uracils 5 with methyl 2,3,5-tri-O-benzoyl-α-D-arabinofuranoside (3) in the presence of trimethylsilyl trifluoromethanesulfonate (TMS triflate) afforded a mixture of the corresponding protected N1,N3-bis(arabinofuranosyl)uracils 6 and the 6-substituted 2,3,5-tri-O-benzoyl-α-D-arabinofuranosyluracils 8. Deprotection of 6 and 8 gave the corresponding α nucleosides 7 and 9. The reaction of silylated 6-ethyl- and 6-methylthiouracil with 3 afforded a mixture of S- and N3-glycosides 10 and 11. The glycosides 10 were deblocked by treatment with methanolic ammonia to obtain the deprotected α nucleosides 12.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1990 (1990), S. 1079-1082 
    ISSN: 0170-2041
    Keywords: Nucleosides ; Antiviral agent ; Azido nucleoside ; Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The α,β-unsaturated D-sugar aldehyde 2, prepared from tri-O-acetyl-D-glucal, was converted into 1-O-acetyl-3-azido-2,3-dideoxy-α-D-arabino-pyranose (3) by reaction with sodium azide in a mixture of acetic acid and water followed by acetylation. Reaction of 3 with silylated pyrimidines using TMS triflate as catalyst followed by deprotection with saturated ammonia in methanol afforded 3′-azido-2′,3′-dideoxy-β-D-arabino-hexopyranosyl nucleosides 4.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1994 (1994), S. 619-621 
    ISSN: 0170-2041
    Keywords: Uridine, methylene-2-thiohydantoin derivative ; Nucleosides ; 2-Thiohydantoin ; Herpes simplex virus ; Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 5-Formyl-1-(2,3,5-tri-O-acetyl-β-D-ribofuranosyl)uracil (4) was synthesized from 5-formyluracil (2) and 1,2,3,5-tetra-O-acetyl-β-D-ribofuranose (3) and condensed with 2-thiohydantoin derivatives 5 by using piperidine as the catalyst to give 5-(uridin-5-ylmethylene)-2-thiohydantoin (8a) and 3-phenyl-5-(uridin-5-ylmethylene)-2-thiohydantoin (8b) after deprotection with sodium methoxide in methanol. Compound 8a was also obtained in an inversed reaction sequence from 5-formyluracil starting with condensation with 2-thiohydantoin and then with 3. The compounds 8a and 8b did not show any activity against HSV-1 or HIV-1.
    Type of Medium: Electronic Resource
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