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  • 1
    Electronic Resource
    Electronic Resource
    Re-examination of Nucleophilic Substitutionin Chlorokojic Acid (2000)
    Springer
    Monatshefte für Chemie 131 (2000), S. 301-307 
    Details
    ISSN: 1434-4475
    Keywords: Keywords. Allomaltol; Azidokojic acid; Iodokojic acid; Isothiocyanatokojic acid; Thiocyanatokojic acid.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary.  Chlorokojic acid was reacted with S2O3 2−, NO3 −, N3 −, I−, and SCN−. Only the three latter nucleophiles substituted the chlorine atom in the 2-CH2Cl group of kojic acid. In none of the products nucleophilic substitution at position 6 of the 4-pyrone could be found. Regular substituion of chlorokojic acid with I− (iodokojic acid), N3 − (azidokojic acid), and SCN− (thiocyanato and isothiocyanato kojic acids) was accompanied by formation of allomaltol. Reaction pathways for the formation of allomaltol and 6-substituted allomaltol derivatives are proposed. The latter has been formerly discovered in the reaction of chlorokojic acid with secondary amines.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s007060070106
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  • 2
    Electronic Resource
    Electronic Resource
    Conversion of Formyl into Cyano groups in kojic acid derivatives and analogues (1996)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 338 (1996), S. 65-68 
    Details
    ISSN: 0941-1216
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: It has been revealed that N,N-dimethylhydrazones (1a-c, 3a,b) derived from kojic acid analogs, such as substituted furans (3a,b), 4-pyrones (1a,b) and 4-pyridine (1c), on oxididation with 3-chloroperoxybenzoic acid afford the corresponding nitriles (2a-c, 4a,b). The method has preparative value. The mechanism of the reaction is presented.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19963380111
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    Paper (German National Licenses)
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