One-Pot Knoevenagel/Imination/6π-Azaelectrocyclization Sequence for the Synthesis of Disubstituted Nicotinonitriles
作者:Li-Chun Lin、Sundaram Suresh、Kun-Wu Lin、Veerababurao Kavala、Ching-Fa Yao
DOI:10.1021/acs.joc.3c00929
日期:2023.7.21
We report on a copper-catalyzed three-component reaction for the synthesis of disubstituted nicotinonitriles using 3-bromopropenals, benzoylacetonitriles, and ammonium acetate (NH4OAc). The Knoevenagel-type condensation of 3-bromopropenals with benzoylacetonitriles gives δ-bromo-2,4-dienones that contain strategically placed functional groups that react with the ammonia generated in situ to give the
我们报道了使用 3-溴丙烯醛、苯甲酰乙腈和乙酸铵 (NH 4 OAc) 合成二取代烟腈的铜催化三组分反应。3-溴丙烯醛与苯甲酰乙腈进行 Knoevenagel 型缩合,得到 δ-溴-2,4-二烯酮,其中含有策略性放置的官能团,可与原位生成的氨反应,生成相应的氮杂三烯。然后这些氮杂三烯可以在反应条件下通过涉及6π-氮杂电环化和芳构化的反应序列转化为三取代的吡啶。