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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1992 (1992), S. 1211-1212 
    ISSN: 0170-2041
    Keywords: Fagomine ; Enzymes ; Transketolase ; Carbohydrates ; Yeast transketolase ; Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Enzyme-Catalyzed Reactions, 13.  -  A New, Efficient Synthesis of Fagomine2-Deoxy-L-threo-5-hexulosonitrile (4) is obtained in excellent chemical yield by yeast transketolase (EC 2.2.1.1)-catalyzed reaction of racemic 3-hydroxy-4-oxobutyronitrile [(R/S)-2] with lithium hydroxypyruvate (3). Catalytic hydrogenation of 4 exclusively gives fagomine (7).
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1992 (1992), S. 1297-1301 
    ISSN: 0170-2041
    Keywords: 5-Thiopentulofuranose ; 6-Thiohexulopyranose ; Rabbit muscle aldolase (RAMA) ; Yeast transketolase ; Carbohydrates ; Enzymes ; Transketolase ; Aldolase ; Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Enzyme-Catalyzed Reactions, 14.  -  Stereoselective Synthesis of Thiosugars from Achiral Starting Compounds by EnzymesA novel synthesis for thiosugars starting from achiral compounds by using enzymes as catalysts is described. 5-Thio-D-threo-2-pentulofuranose (4), for example, is prepared either by the RAMA (rabbit muscle aldolase)-catalyzed reaction of mercaptoacetaldehyde (1b) with dihydroxyacetonephosphate (2) or by the yeast transketolase-catalyzed reaction of 2-hydroxy-3-mercaptopanal (R/S)-6 with lithium 3-hydroxypyruvate (9). 6-Thio-D-arabino-2-hexulopyranose (8a) and 6-thio-L-xylo-2-hexulopyranose (8b) are obtained by the RAMA-catalyzed reaction of racemic (R/S)-6 with 2.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 121 (1988), S. 125-130 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Intramolecular Friedel-Crafts Acylation of N-Phthaloyl-Substituted Arylalanyl and Homophenylalanyl ChloridesN-Phthaloyl-protected arylalanyl and homophenylalanyl chlorides 5 are acylated intramolecularly to 2-phtahlimido-1-indanones 6 and -1-tetralone (6d) with AlCl3 (two-fold molar amounts) or catalytic amounts of FeCl3. The cycloacylation to the tetralone 6d with AlCl3 or FeCl3 proceeds without racemisation in very good yields, whereas the cycloacylation to the indanone 6a with FeCl3 gives rise to racemisation. Mixed anhydrides 11 of N-phthaloyl-α-amino acids and trifluoromethanesulfonate were prepared from the N-phthaloylamino acid chlorides and silver triflate. Acylation of arenes 12 with 11a as well as cycloaddition of (S)-O-methyl-N-phthaloyltyrosine triflate [(S)-11e] can be achieved without racemisation and without a catalyst.
    Notes: Die intramolekulare Acylierung von N-Phthaloyl-geschützten Aryl- und Homophenylalanychloriden 5 mit zweifach molaren Mengen AlCl3 oder katalytischen Mengen FeCl3 führt zu 2-Phthal-imido-l-indanonen 6 bzw. -1-tetralon (6d). Während die Cyclo-acylierung zum Tetralon 6d mit AlCl3 und mit FeCl3 racemisierungsfrei mit sehr guten Ausbeuten abläuft, erfolgt die Bildung des Indanons 6a mit FeCl3 unter Racemisierung. N-Phthaloyl-geschützte α-Aminosäurechloride bilden mit Silber-trifluormethansulfonat gemischte Anhydride (z.B. 11a), die ohne Verwendung eines Katalysators racemisierungsfrei cyclisieren (s. z.B. 6e).
    Additional Material: 4 Tab.
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  • 4
    Publication Date: 1992-09-01
    Print ISSN: 0040-4039
    Electronic ISSN: 1873-3581
    Topics: Chemistry and Pharmacology
    Published by Elsevier
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