An efficient method has been developed for the synthesis of benzofuro[3,2-b]quinolines through tandem [4+2] cycloaddition/ aromatization under transition-metal-free conditions. A range of aurone­-derived N-tosyl-1-azadienes smoothly reacted with arynes, generated­ in situ via fluoride ion-induced 1,2-elimination of 2-(trimethyl­silyl)aryl triflates, delivering structurally diverse benzofuro[3,2-b]quinolines in moderate to good yields.

中文翻译：

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1-氮杂二烯和芳炔合成苯并呋喃[3,2-b]喹啉

已开发出一种在无过渡金属条件下通过串联 [4+2] 环加成/芳构化合成苯并呋喃 [3,2-b] 喹啉的有效方法。一系列金酮衍生的 N-tosyl-1-azadienes 与芳烃顺利反应，通过氟离子诱导的 1,2-消除 2-（三甲基甲硅烷基）芳基三氟甲磺酸酯原位生成，提供结构多样化的苯并呋喃 [3,2-b ]喹啉的产量适中。