We report a Bismuth(III)triflate catalyzed novel, efficient and atom-economical one-pot three-component methodology for the synthesis of furo[3,2-c]-coumarins from arylglyoxals, 4-hydroxycoumarins and N-substituted anilines. While using N-methyl aniline, we have obtained both the furocoumarins and three-component adducts, whereas with N,N-dimethyl aniline and N,N-diethyl aniline, the reactions procced well giving only the three-component adducts. Further, these adducts on treatment with BF3.OEt2 in toluene at 100 °C have afforded the desired furo[3,2-c]-coumarins.

中文翻译：

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通过芳基乙二醛一水合物、香豆素和 N-取代苯胺的三组分反应，Bi(III) 催化合成呋喃香豆素


我们报道了一种三氟甲磺酸铋(III)催化的新型、高效且原子经济的一锅三组分方法，用于从芳基乙二醛、4-羟基香豆素和N-取代苯胺合成呋喃[3,2-c]-香豆素。当使用N-甲基苯胺时，我们得到了呋喃香豆素和三组分加合物，而使用N,N-二甲基苯胺和N,N-二乙基苯胺时，反应进行得很好，仅得到三组分加合物。此外，这些加合物在100℃下在甲苯中用BF3.OEt2处理得到了所需的呋喃[3,2-c]-香豆素。