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  • Chemistry  (2)
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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1988 (1988), S. 737-742 
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Synthese von Pyrimidin-Analoga des Nucleosid-Antibiotikums AscamycinVier Analoga des Ascamycins 〈5′-O′-O-[N-(L-alanyl)sulfamoyl]-2-chloradenosin〉(1), bei welchen der 2-Chloradenosinrest durch Uridin, Thymidin, Cytidin und 2′-Deoxy-5-methylcytidin ersetzt wurde, sind durch selektive Aminoacylierung der 5′-O-Sulfamoyl-Derivate 2, 9, 14 und 21 des 2′,3′-Di-O-acetyluridins, 3′-O-Acetylthymidins, 2′,3′-O-Isopropylidencytidins, bzw. des 3′-O-Acetyl-2′-deoxy-5-methylcytidins mit Boc-L-Ala-OSu in DMF und in Anwesenheit von DBU, mit nachfolgender Abspaltung der Schutzgruppen, erhalten worden. Ähnlich wurde 5′-O-[N-(D-Alanyl)sulfamoyl]uridin (8) ausgehend von Boc-D-Ala-OSu und 2 hergestellt. Die Verbindungen 14 und 21 wurden direkt durch Sulfamoylierung der 4-N-(Dimethylamino)methylen-Derivate 13 und 20 von 2′,3′-O-Isopropylidencytidin bzw. 3′-O-Acetyl-2′-deoxy-5-methylcytidin über die 5′-O-Tributylzinn-Zwischenverbindungen dargestellt. Verbindung 20 wurde aus 5′-O-Isopropylidencytidin bzw. 3′-O-Acetyl-2′-deoxy-5-methylcytidin über die 5′-O-Tributylzinn-Zwischenverbindungen dargestellt. Verbindung 20 wurde aus 5′-O-(tert-Bu-tyldimethylsilyl)thymidin (17) mittels Acetylierung und nachfolgende Überführung des Thymidinrestes in 5-Methylcytosin über das entsprechende Triazolylpyrimidinon unter Schutz der Amidingruppe erhalten.
    Notes: Four analogues of ascamycin 〈5′-O-[N-(L-alanyl)sulfamoyl]-2-chloroadenosine〉 (1) in which the 2-chloroadenosine moiety has been replaced by uridine, thymidine, cytidine, and 2′-deoxy-5-methylcytidine have been synthesized by selective aminoacylation of the 5′-O-sulfamoyl derivatives 2, 9, 14, and 21 of 2′,3′-di-O-acetyluridine, 3′-O-acetylthymidine, 2′,3′-O-isopropylidenecytidine, and 3′-O-acetyl-2′-deoxy-5-methylcytidine, respectively, with Boc-L-Ala-OSu in DMF and in the presence of DBU, followed by removal of the protecting groups. Similarly, 5′-O-[N-(D-alanyl)sulfamoyl]uridine (8) has been prepared from Boc-D-Ala-OSu and 2. Compounds 14 and 21 were directly prepared by sulfamoylation of the 4-N-(dimethylamino)methylene derivatives 13 and 20 of 2′,3′-O-isopropylidenecytidine and 3′-O-acetyl-2′-deoxy-5-methylcytidine, respectively, via the intermediate 5′-O-tributyltin derivatives. Compound 20 was obtained from 5′-O-(tert-butyldimethylsilyl)thymidine (17) by a route involving acetylation, conversion of the thymidine moiety into 5-methylcytosine through the corresponding triazolylpyrimidinone, and amidine protection.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1987 (1987), S. 1017-1020 
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Synthese von N-(Glucopyranosid-3-yl)-D- und -L-alanyl-D-isoglutamin und verwandten GlycodipeptidenEs wurden sechs Glucodipeptide dargestellt, bei denen der D-Lactyl-L-alanyl-Rest des immunoadjuvanten Muramyldipeptids durch D-Ala, L-Ala und Gly ersetzt wurde. Die Kupplungsreaktion von Benzyl-2-acetamido-4,6-O -benzylidene-3-[R-(1-carboxyethyl)amino]-2,3-dideoxy-α-D-glucopyranosid 8, 9 bzw. 10 mit D-Isoglutamin-methylester und D-Glutamin-methylester und nachfolgende Hydrogenolyse ergab die entsprechenden N-(2-Acetamino-2,3-dideoxy-D-glucopyranosid-3-yl)-Derivate von D-Ala-D-iso-Gln-OMe (14), L-Ala-D-isoGln-OMe (15), Gly-D-isoGln-OMe (16), D-Ala-D-Gln-OMe (20), L-Ala-D-Gln-OMe (21) und Gly-D-Gln-OMe (22).
    Notes: Six glucodipeptides, in which the D-lactyl-L-alanyl residue of the immunoadjuvant myramyl dipeptide is replaced by D-Ala, L-Ala, and Gly, have been synthesized. Coupling of benzyl 2-acetamido-4,6-O-benzylidene-3-[R-(1-carboxyethyl)amino-, -S-(1-carboxyethyl)amino-, and -(carboxymethyl)amino]-2,3-dideoxy-α-D-glucopyranosides 8,9, and 10, respectively, with D-isoglutamine methyl ester and D-glutamine methyl ester followed by hydrogenolysis afforded the corresponding N-(2-acetamido-2,3-dideoxy-D-glucopyranosid-3-yl) derivatives of D-Ala-D-isoGln-OMe (14), L-Ala-D-isoGln-OMe (15), Gly-D-isoGln-OMe (16), D-Ala-D-Gln-OMe (20), L-Ala-D-Gln-OMe (21), and Gly-D-OMe (22).
    Type of Medium: Electronic Resource
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