An unprecedented Bi(OTf)₃-catalyzed reaction between 2-arylisatogens and vinylarenes to yield 2,4-diarylquinolines is reported. The transformation occurred via a Bi^III-coordination to the embedded anionic nitrone oxygen, which induced a regiospecific stepwise formal [4 + 2]-cycloaddition with vinylarenes to yield a strained tricyclic intermediate, which subsequently extruded gaseous carbon monoxide. N-Deoxygenative aromatization ensued to produce 2,4-diarylquinolines. The protocol was applicable to a variety of substrates to produce the quinolines in up to an 89% yield.

中文翻译：

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Bi（OTf）3-催化的 2-芳基生成剂和苯乙烯之间的级联环加成-脱羰-N-脱氧芳构化：揭示 2,4-二芳基喹啉的合成


据报道，2-芳基生成剂和乙烯基芳烃之间发生了前所未有的 Bi（OTf）₃ 催化反应，生成 2,4-二芳基喹啉。通过对嵌入的阴离子硝氧的 Bi^III 配位发生转变，这诱导了与乙烯基芳烃的区域特异性逐步形式 [4 + 2] -环加成反应，以产生应变的三环中间体，随后挤出气态一氧化碳。随后 N-脱氧芳构化生成 2,4-二芳基喹啉。该方案适用于各种底物，以高达 89% 的产率生产喹啉。