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  • 1985-1989  (1)
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  • 1
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Eine bequeme Einstufen-Synthese für substituierte 12H-Chinoxalino[2,3-b][1,4]benzothiazine und -benzoxazine2,3-Dichlorchinoxalin (4) und die 2-Aminothiphenole 1a-h oder deren Zink-mercaptide 3a-h reagieren in alkalischem Dimethylformamid oder saurem Medium unter Cyclokondensation mit guten Ausbeuten zu entsprechenden 12H-Chinoxalino-[2,3-b][1,4]benzothiazinen 7a-h. Analog liefert die Umsetzung substituierter 2-Aminophenole 2 in basischem DMF die 12H-Chinoxalino[2,3-b][1,4]benzoxazine 7i-k. Ferner wurden Acetylderivate von 7a-k hergestellt.
    Notes: Cyclocondensation of 2,3-dichloroquinoxaline (4) and the 2-aminothiophenols 1a-h or their zinc mercaptides 3a-h in the presence of alkaline dimethylformamide or in acidic medium afforded the corresponding 12H-quinoxalino[2,3-b][1,4]benzothiazines 7a-h in excellent yields. Similarly, the reaction of 4 with substituted 2-aminophenols 2 in the presence of base using dimethylformamide as solvent gave the 12H-quinoxalino[2,3-b][1,4]-benzoxazines 7i-k. Acetyl derivatives of 7a-k were prepared.
    Type of Medium: Electronic Resource
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