The cyclization of 2-dialkylamino-2′-halogeno- and 2-chloro-2′-(dialkylamino)acetanilides to quinoxaline derivatives has been studied in detail. These reactions proceed, respectively, through intramolecular aromatic nucleophilic or aliphatic nucleophilic substitution reactions and depending on the substituents and the experimental conditions, they lead to 3-oxoquinoxalinium salts or, after an alkyl chloride elimination, to quinoxalin-2-ones. Some new cases of the little known intramolecular quaternization of tertiary amines with aryl halides are described.
对2-二烷基
氨基-2′-卤烷基和2-
氯-2′-(二烷基
氨基)
乙酰苯胺环化为喹喏啉衍
生物的反应进行了详细研究。根据取代基和实验条件,这些反应通过分子内芳香族亲核或脂肪族亲核取代反应进行,分别生成3-氧喹喏啉盐,或者在消除烷基
氯之后生成喹喏啉-2-酮。还描述了一些关于芳基卤化物与三
氟氨基化物的分子内季
铵化的新案例。