作者:E. Angeles、H. Santillán、I. Menconi、I. Martínez、A. Ramírez、A. Velázquez、R. López- Castañares、R. Martínez
DOI:10.3390/60800683
日期:——
The reaction of 5-hydroxy-2-nitrobenzaldehyde with ethyl acetoacetate in ammonia gave the two expected isomeric 1,4- and 1,2-dihydropyridines resulting from the normal Hantzsch reaction. However, the combination of 2-nitrobenzaldehyde with ethyl acetoacetate under the same conditions yielded four products: the two normal isomeric dihydropyridines and two tricyclic compounds. When we attempted to independently
5-羟基-2-硝基苯甲醛与乙酰乙酸乙酯在氨中的反应得到两种预期的异构体1,4-和1,2-二氢吡啶,由正常的Hantzsch反应产生。然而,2-硝基苯甲醛与乙酰乙酸乙酯在相同条件下的组合产生四种产物:两种正常的异构二氢吡啶和两种三环化合物。当我们试图通过 4-(2-硝基苯基)-2,6-二甲基-3,5-二羧基-1,4-二氢吡啶和 2-(2-硝基苯基)-4 的还原环化独立合成这两种三环化合物时, 6-二甲基-3,5-二羧基-1,2-二氢吡啶与氯化锡(II)在盐酸介质中,我们分别获得了吲哚和喹啉衍生物。