Iminocarbocation intermediates were in situ-generated by treating various oximes with trifluoromethanesulfonic anhydride (Tf2O) in the presence of triethylamine in toluene and nucleophilic trapping with amines or sodium enolates under mild conditions afforded the corresponding amidines and enamines. Some of the thus-obtained enamines were converted to 2-substituted 4-oxo-3-quinolinecarboxylic acid derivatives by subsequent intramolecular Friedel–Crafts acylation.
通过将各种
肟在
甲苯中与
三氟甲磺酸酐(Tf2O)和
三乙胺反应,原位生成
亚胺碳正中间体,并在温和条件下用胺或烯醇
钠捕捉,得到相应的脒和烯胺。部分获得的烯胺随后通过分子内 Friedel-Crafts 酰基化反应转化为 2-取代的 4-氧代-
3-喹啉羧酸衍
生物。