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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 111 (1978), S. 3912-3926 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The Synthesis of 2,3-Diamino-2,3-dideoxy-D-glycosides from 3-Azidoglycals via their Nitrosyl Chloride Adducts4,6-Di-O-acetyl-3-azido-1, 2, 3-trideoxy-D-arabino-hex-1-enopyranose (1) adds nitrosyl chloride to yield the dimeric 4,6-di-O-acetyl-3-azido-2,3-dideoxy-2-nitroso- α-D-gluco-hexopyranosyl chloride (2), which reacts with isopropyl alcohol in DMF to afford both the glycosides 3 and 6. By means of a two-step reduction with diborane/THF and palladium/H2 the 2,3-diamino-2,3-dideoxy-β-D-mannoside 9. Starting with the dimeric chloride 11, the E- and Z-oximino-α-D-glycosides 13a and 13b are obtained as the main-products and the corresponding β-anomers 12a and 12b as by-products. By successive reduction of the mixture of 13a and 13b with diborane and palladium/H2 the 2,3-diamino-2,3-dideoxy-α-D-alloside 15 is available stereoselectively, by reduction with LiAlH4 the 2,3-diamino-2,3-dideoxy-α-D-altroside 16 is also formed. By analogy with 15 the disaccharide 26 is prepared.
    Notes: 4,6-Di-O-acetyl-3-azido-1,2,3-tridesoxy-D- arabino-hex-1 enopyranose (1) addiert Nitrosylchlorid zum dimeren 4,6-Di-O-acetyl-3-azido-2, 3-didesoxy-2-nitroso-α-D-gluco-hexopyranosylchlorid (2). das mit Isopropylalkohol in DMF die beiden Glycoside 3 und 6 bildet. Durch zweistufige Reduktion mit Diboran/THF und Palladium/H2 entsteht stereoselektiv aus 3 das 2, 3-Diamino-2, 3-didesoxy-β-D-mannosid 5 und aus 6 das 2,3-Diamino-2,3-didesoxy-α-D-glucosid 8. Mit LiAlH4 entsteht aus 6 neben 8 das isomere 2,3-Diamino-2,3-didesoxy-α-D-mannosid 9. Aus dem dimeren Chlorid 11 werden die E- und Z-Oximino-α-D-glycoside 13a und 13b als Hauptprodukte, die entsprechenden β-Anomeren 12a und 12b als Nebenprodukte erhalten. Durch sukzessive Reduktion des Gemischs aus 13a und 13b mit Diboran und Palladium/H2 ist stereoselektiv das 2,3-Diamino-2,3-didesoxy-α-D-allosid 15 zugänglich, durch Reduktion mit LiAlH4 wird daneben das 2,3-Diamino-2,3-didesoxy-α-D-altrosid 16 gebildet. Analog zu 15 wird das Disaccharid 26 dargestellt.
    Type of Medium: Electronic Resource
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