A highly efficient and convenient metal‐free, one‐pot synthesis of diversely substituted (tetrahydro)quinolines has been achieved through a three‐component assembly reaction of arenediazonium salts, nitriles, and styrenes. In sharp contrast to the prior works with the same reagent blend, the formation of N‐arylnitrilium intermediates from arenediazonium salts and nitriles was followed by reaction with styrenes, leading to 3,4‐dihydroquinolinium salts as a common intermediate. These could be further transformed to quinolines and tetrahydroquinolines depending on the reaction conditions. The advantages of this protocol include its simplicity, metal‐free and mild conditions, readily available starting materials, and good functional group tolerance.

中文翻译：

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通过四组分芳烃重氮盐，腈和苯乙烯的无金属一锅合成（四氢）喹啉

通过芳构氮杂鎓盐，腈和苯乙烯的三组分组装反应，实现了高效，便捷的无金属，单锅合成多种取代的（四氢）喹啉。与使用相同试剂共混物的先前工作形成鲜明对比的是，由芳构氮鎓盐和腈形成N-芳基腈中间体，然后与苯乙烯反应，生成3,4-二氢喹啉鎓盐作为常见中间体。根据反应条件，它们可以进一步转化为喹啉和四氢喹啉。该协议的优点包括简单，无金属和温和的条件，易于获得的起始原料以及良好的官能团耐受性。