Abstract

An improved one-pot three-component reaction of carbonyl compounds (dimedon, 4-hydroxy coumarin and 1,3-cyclohexadion) with malononitrile and aryl aldehydes in aqueous media (H₂O:EtOH) as a solvent with short reaction time for the synthesis of benzo[b]pyran and 3,4- dihydropyrano[c]chromane derivatives by using nanostructured coumarin-based cobalt complex as an efficient heterogeneous catalyst. The salient features of this new protocol include simple procedure, high yields, easy isolation of products without need to column chromatography and short reaction times. Also, the nanocatalyst was recovered by adding EtOH and reused five times without significant loss of its catalytic activity. Biological impact assessments of the complex were conducted by DNA cleavage ability assay and eukaryotic cell toxicity measurement. Although the complex showed single-strand DNA breakage under oxidative conditions, its high polar nature revealed a marked decrease in cell toxicity data due to the restriction on cell entry.

Graphic abstract

中文翻译：

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纳米结构香豆素基钴配合物可作为三组分合成苯并[b]吡喃和3,4-二氢吡喃[c]亚甲基衍生物的高效，多相和可循环利用的催化剂

摘要

改进的一锅三组分羰基化合物（二甲双胍，4-羟基香豆素和1,3-环己二酮）与丙二腈和芳醛在水性介质（H ₂ O：EtOH）中作为溶剂的反应，反应时间短。苯并[ b ]吡喃和3,4-二氢吡喃[ c的合成通过使用纳米结构的香豆素基钴配合物作为有效的非均相催化剂，可制得[] ane烷衍生物。该新方案的显着特征包括操作简单，产率高，无需柱色谱法即可轻松分离产物和缩短反应时间。另外，通过添加EtOH回收了纳米催化剂，并重复使用了五次而其催化活性没有明显损失。通过DNA切割能力测定和真核细胞毒性测定进行复合物的生物影响评估。尽管该复合物在氧化条件下显示单链DNA断裂，但由于对细胞进入的限制，其高极性性质显示出细胞毒性数据的显着下降。

图形摘要