Synthesis of pyrano[3,2-c]quinoline-4-carboxylates and 2-(4-oxo-1,4-dihydroquinolin-3-yl)fumarates
作者:Essmat M. El-Sheref、Ashraf A. Aly、Aboul-Fetouh E. Mourad、Alan B. Brown、Stefan Bräse、Momtaz E. M. Bakheet
DOI:10.1007/s11696-017-0269-6
日期:2018.1
Reaction of equimolar amounts of 2,4(1H,3H)-quinolinediones and diethyl acetylenedicarboxylate in absolute ethanol, containing catalytic triethylamine, gave ethyl 5,6-dihydro-2,5-dioxo-6,9-disubstituted-2H-pyrano[3,2-c]quinoline-4-carboxylates in good yields. In a different manner, reaction of two equivalents of dialkyl acetylenedicarboxylates with one equivalent of 2,4(1H,3H)-quinolinediones afforded dialkyl 2(4-oxo-1,4-dihydroquinolin-3-yl)fumarates in good yields. The structures of the products were elucidated by 1H NMR, 13C NMR, two-dimensional NMR, IR, mass spectra and elemental analyses.
等摩尔量的 2,4(1H,3H)-喹啉二酮和乙炔二甲酸二乙酯在含有三乙胺催化剂的绝对乙醇中反应,得到 5,6-二氢-2,5-二氧代-6,9-二取代-2H-吡喃并[3,2-c]喹啉-4-羧酸乙酯,产率良好。用另一种方法,将两个等量的乙炔二羧酸二烷基酯与一个等量的 2,4(1H,3H)-喹啉二酮反应,可以得到 2(4-氧代-1,4-二氢喹啉-3-基)富马酸二烷基酯,收率很高。产品的结构通过 1H NMR、13C NMR、二维 NMR、IR、质谱和元素分析得以阐明。