Palladium-Catalyzed Cascade Reactions of 2-(Cyanomethoxy)chalcones with Arylboronic Acids: Selective Synthesis of Emissive Benzofuro[2,3-<i>c</i>]pyridines
The Pd(II)-catalyzed cascade reactions of 2-(cyanomethoxy)chalcones with arylboronic acids were demonstrated, allowing the rapid construction of benzofuro[2,3-c]pyridine skeletons with excellent selectivity. These transformations involve the domino-style formation of C-C/C-C/C-N bonds through nitrile carbopalladation, intramolecular Michael addition, cyclization, and aromatization. This chemistry allows
钯(II)催化2-(氰基甲氧基)查康酮与芳基硼酸的级联反应,可以快速构建具有优异选择性的苯并呋喃[2,3-c]吡啶骨架。这些转变涉及通过腈碳酸酯化,分子内迈克尔加成,环化和芳构化来形成CC / CC / CN键的多米诺骨风格。该化学反应使得2-(氰基甲氧基)查耳酮与噻吩-3-基硼酸反应,以中等至良好的产率提供3-芳基-1-(噻吩-3-基)苯并呋喃[2,3-c]吡啶。另外,所得产物代表了新型的发射荧光团。
A Facile Approach for Synthesis of Benzofuro[2,3-<i>c</i>]pyridines<i>via</i>Intramolecular Cascade Annulations
作者:Ying Duan、Ye Wang、Dongmi Li
DOI:10.1002/cjoc.201400364
日期:2014.11
A facile synthesis of benzofuro[2,3‐c]pyridines has been achieved under mild conditions by using ammonium acetate as the nitrogen source through intramolecular cascade annulation. This reaction could efficiently construct pyridinering and furanring in one step. Moreover, the key annulation step was demonstrated through dihydrobenzofuran intermediates.
在轻度条件下,通过乙酸铵作为分子内级联环氧化氮源,可以轻松合成苯并呋喃[2,3- c ]吡啶。该反应可一步有效地构建吡啶环和呋喃环。此外,关键的环合步骤通过二氢苯并呋喃中间体进行了证明。