首页> 外文期刊>RSC Advances >Ball milling for the quantitative and specific solvent-free Knoevenagel condensation + Michael addition cascade in the synthesis of various 2-amino-4-aryl-3-cyano-4H-chromenes without heating
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Ball milling for the quantitative and specific solvent-free Knoevenagel condensation + Michael addition cascade in the synthesis of various 2-amino-4-aryl-3-cyano-4H-chromenes without heating

机译:用于定量和特异性无溶剂的KNOEVENAGEL缩合+ MICHAEL添加级联的球磨,在合成各种2-氨基-4-芳基-3-氰基-4H-色度的情况下,无需加热

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摘要

Ball milling is used as a facile, efficient, cheap, and environmentally friendly procedure for the solvent-free three-component reaction of aromatic aldehydes with malononitrile and dimedone, or 1,3-cyclohexanedione, resorcinol, and α- and β-naphthol. The reactions proceed quantitatively at room temperature by milling stoichiometric mixtures of the reagents in the presence of 10 mol% Na _(2) CO _(3) . This method offers the advantages of short reaction times, low cost, quantitative yields and simple work-up with no need of any organic solvent. It is thus enviro-economic without producing dangerous wastes. The orientation selectivity with β-naphthol and resorcinol is discussed. Existing structural misattributions are pointed out and clarified by ~(1) H NMR spin coupling analysis.
机译:球磨用作芳香族醛与丙二腈和亚硝基镍,或1,3-环己酰胺,间苯二酚和α-萘酚的无溶剂三组分反应的容易,高效,廉价和环保的程序。通过在10mol%Na _(2)CO _(3)存在下通过研磨化学计量混合物,在室温下定量地进行定量。该方法提供了反应时间短,成本低,定量产量和简单的处理,无需任何有机溶剂,提供了较短的优点。因此,在不产生危险废物的情况下是对经济的。讨论了与β-萘酚和间苯二酚的定向选择性。通过〜(1)H NMR自旋耦合分析指出并澄清存在现有的结构误差。

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