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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 113 (1980), S. 1723-1745 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Cyclitol Reactions, I Syntheses of New Aminocyclitols by Conversion of 2-Deoxystreptamine DerivativesStarting from 2-deoxystreptamine several derivatives were synthesized which are selectively blocked by mesyl-, tosyl-, benzyl-, and N, O-carbonyl groups. From 1,3-N, N-carbonyl-4-O-mesyl-2-deoxystreptamine (25) the epoxide 24 was made accessible which can rearrange to the isomeric epoxide 23. Opening of the oxirane rings of 23 and 24 with sodium azide yields the diamino-azido-cyclitols 26 and 28, respectively. Reaction of 1,3-bis-N-(benzyloxycarbonyl)-5,6-O-isopropylidene-4-O-mesyl-2-deoxystreptamine (30) with sodium hydride yields the epimine 31. Opening of 31 with sodium acetate affords diamino-cyclitols, with sodium azide diamino-azido-cyclitols, and with hydrogen over Raney-nickel diamino-deoxy-cyclitols. Oxidation of the derivative 6 yields the diamino-inosose 45. Oxidation of the unsubstituted amino group in 10 with 3,5-di-tert-butyl-1,2-benzoquinone (47) leads via 49 to the aminoreductone 50.
    Notes: Ausgehend von 2-Desoxystreptamin wurden eine Reihe von Derivaten dargestellt, die ein selektives Verteilungsmuster von Mesyl-, Tosyl-, Benzyl- und N, O-Carbonyl-Blockierungsgruppen enthalten. Aus 1,3-N, N-Carbonyl-4-O-mesyl-2-desoxystreptamin (25) ließ sich das Epoxid 24 gewinnen, das zum isomeren Epoxid 23 umlagern kann. Die Epoxidringöffnung mit Natriumazid führt ausgehend von 23 und 24 zu den Diamino-azido-cycliten 26 und 28. 1,3-Bis-N-(benzyloxycarbonyl)-5,6-O-isopropyliden-4-O-mesyl-2-desoxystreptamin (30) liefert mit Natriumhydrid das Epimin 31. Dieses kann mit Natriumacetat zu Diamino-cycliten, mit Natriumazid zu Diaminoazido-cycliten und mit Raney-Nickel/H2 zu Diamino-desoxy-cycliten geöffnet werden. Oxidation des Derivats 6 ergibt die Diamino-inosose 45. Die Oxidation der isolierten Aminogruppe in 10 mit 3,5-Di-tert-butyl-1,2-benzochinon (47) führt über 49 zum Aminoreducton 50.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 113 (1980), S. 2055-2061 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Direct Hydroxymethylation to Branched-chain Sugars by means of a Hydroxymethyl-d1 ReagentBlocked ketoses react with the dianion 2 directly to hydroxymethylation products. Butylation products have been found as by-products. The procedure in which the yields are limited can be used favourably in special cases.
    Type of Medium: Electronic Resource
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