An efficient annulation reaction of aurone-derived α,β-unsaturated imines and activated terminal alkynes mediated by triethylamine is described, which enables the facile synthesis of 1,4-dihydrobenzofuro[3,2-b]pyridines in high yields. When the nucleophile of triethylamine was replaced with triphenylphosphine, another class of 1,4-dihydrobenzofuro[3,2-b]pyridines tethered with an additional acrylate motif were obtained instead. These two types of 1,4-dihydrobenzofuro[3,2-b]pyridines could be aromatized in the presence of DBU to afford benzofuro[3,2-b]pyridines, which could also be accessed via a one-pot procedure.

中文翻译：

---

从金酮衍生的 α,β-不饱和亚胺和活化的末端炔烃以多样性为导向合成苯并呋喃 [3,2-b] 吡啶衍生物

介绍了一种由三乙胺介导的金酮衍生的 α,β-不饱和亚胺和活化的末端炔烃的有效环化反应，该反应能够以高产率轻松合成 1,4-二氢苯并呋喃 [3,2- b ] 吡啶。当三乙胺的亲核试剂被三苯基膦取代时，获得了另一类与额外的丙烯酸酯基序相连的 1,4-二氢苯并呋喃 [3,2- b ] 吡啶。这两种类型的 1,4-二氢苯并呋喃 [3,2- b ] 吡啶可以在 DBU 存在下芳构化以提供苯并呋喃 [3,2- b ] 吡啶，也可以通过一锅法获得。