Abstract

An impressive procedure for synthesis of benzo[5,6]chromeno[2,3-b]quinolin derivatives is described. First, benzo[f]chromene-2-carbonitriles are synthesized from the reaction of aryl aldehydes, malononitrile, and β-naphthol in the presence of silica sodium carbonate as a heterogeneous basic catalyst. Next, the prepared benzo[f]chromene-2-carbonitriles are reacted with cyclohexanone using 10 mol% of silica tungstic acid as an efficient and recyclable catalyst to produce known and unknown benzo[5,6]chromeno[2,3-b]quinolin derivatives under solvent-free conditions in good to excellent yields.

中文翻译：

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硅钨酸作为可回收催化剂在绿色条件下合成苯并[5,6]铬诺[2,3-b]喹啉

摘要

描述了一种令人印象深刻的合成苯并[5,6]色烯[2,3- b ]喹啉衍生物的方法。首先，在作为非均相碱性催化剂的二氧化硅碳酸钠存在下，由芳基醛、丙二腈和β-萘酚反应合成苯并[ f ]色烯-2-甲腈。接下来，将制备的苯并[ f ]色烯-2-甲腈与环己酮反应，使用10 mol%的硅钨酸作为高效且可回收的催化剂，生成已知和未知的苯并[5,6]色烯[2,3- b ]喹啉衍生物在无溶剂条件下具有良好至极好的收率。