6-Ethyl-4,5-dioxo-5,6-dihydro-4H-pyrano[3,2-c]quinoline-3-carbox-aldehyde (1) was prepared and utilized as a starting material. Carboxaldehyde 1 was subjected to react with a diversity of carbon nucleophiles producing a variety of condensation products as well as heterocyclic rings linked pyrano[3,2-c]quinolines. Also, reaction of carboxaldehyde 1 with p-toluidine, heterocyclic amines and some hydrazine derivatives produced a variety of products. The structures of the new synthesized products were deduced on the basis of their analytical and spectral data.

中文翻译：

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6-乙基-4,5-二氧-5,6-二氢-4的反应活性

制备6-乙基-4,5-二氧代-5,6-二氢-4 H-吡喃并[3,2 - c ]喹啉-3-羧醛（1 ），并将其用作起始原料。使甲醛1与多种碳亲核试剂反应，生成各种缩合产物以及杂环连接的吡喃并[3,2- c ]喹啉。同样，羧醛1与对甲苯胺，杂环胺和一些肼衍生物的反应产生了多种产物。根据新合成产物的分析和光谱数据推导其结构。