在这项工作中,开发了一种使用固体酸性催化剂从 1,3-二酮、伯胺、苯乙二醛一水合物和丙二腈合成苯并[ a ]咔唑的新方法。该多组分反应提供了3-氰基乙酰胺吡咯作为中间体,然后通过分子内闭环形成苯并[ a ]咔唑。反应在240℃下进行2小时,得到目标产物,收率73%。由稻壳衍生的无定形碳和磺酸核(AC-SO 3 H)制成的固体酸催化剂上的酸性位点提供了最佳的活性。催化剂表面的酸性位点,包括羧酸、酚酸和磺酸,总酸度为4.606 mmol g -1 。AC-SO 3 H 表现出低成本、低毒性、多孔性、稳定性、调节灵活性和可重复使用性。
Synthesis of new 3-cyanoacetamide pyrrole and 3-acetonitrile pyrrole derivatives
作者:Mohammad Bayat、Shima Nasri、Behrouz Notash
DOI:10.1016/j.tet.2017.02.005
日期:2017.3
A new fused heterocyclic derivatives of pyrrole containing acetonitrile or cyanoacetonitrile moiety at 3-position is described by a one-pot multicomponent reaction. The reaction of dimedone, various aniline, aryl glyoxal with malononitrile/ethyl cyanoacetate/methyl cyanoacetate under mild conditions. The present method does not involve any hazardous organic solvents or catalysts. The significant features
employing a solid acidic catalyst has been developed. The multicomponent reaction provided 3-cyanoacetamide pyrrole as an intermediate and then the formation of benzo[a]carbazole via intramolecular ring closure. The reaction was carried out for 2 h at 240 °C, resulting in the desired product with 73% yield. Acidic sites on the solid acid catalyst, made from rice husk-derived amorphous carbon with a sulfonic
在这项工作中,开发了一种使用固体酸性催化剂从 1,3-二酮、伯胺、苯乙二醛一水合物和丙二腈合成苯并[ a ]咔唑的新方法。该多组分反应提供了3-氰基乙酰胺吡咯作为中间体,然后通过分子内闭环形成苯并[ a ]咔唑。反应在240℃下进行2小时,得到目标产物,收率73%。由稻壳衍生的无定形碳和磺酸核(AC-SO 3 H)制成的固体酸催化剂上的酸性位点提供了最佳的活性。催化剂表面的酸性位点,包括羧酸、酚酸和磺酸,总酸度为4.606 mmol g -1 。AC-SO 3 H 表现出低成本、低毒性、多孔性、稳定性、调节灵活性和可重复使用性。