Thermal cyclocondensation of starting ethyl (1-methyl-5- and 6-benzimidazolyl/benzotriazolyl)aminomethylenepropanedioates (Ia - Ie) in aprotic medium gives angularly condensed ethyl azolo[4,5-f]quinolonecarboxylates IIa, IIc, IIe and azolo[5,4-f]quinolonecarboxylates IIb, IId, respectively, which are hydrolyzed to the corresponding carboxylic acid III in acid medium. The structure of reaction products has been confirmed by 1H and 13C NMR, IR, and UV spectroscopy.
起始物质乙酰(1-甲基-5-和6-
苯并咪唑基/苯并三唑基)
氨甲基丙二酸乙酯(Ia-Ie)在无极性介质中进行热环化反应,生成角状紧缩的乙酰氮杂[4,5-f]
喹啉羧酸乙酯(IIa,IIc,IIe)和氮杂[5,4-f]
喹啉羧酸乙酯(IIb,IId),分别在酸性介质中
水解成相应的
羧酸(III)。反应产物的结构已通过1H和13C NMR、IR和UV光谱得到确认。