Palladium-Catalyzed Cascade Reactions of 2-(Cyanomethoxy)chalcones with Arylboronic Acids: Selective Synthesis of Emissive Benzofuro[2,3-<i>c</i>]pyridines
作者:Wenzhang Xiong、Kun Hu、Yunxiang Lei、Qianqian Zhen、Zhiwei Zhao、Yinlin Shao、Renhao Li、Yetong Zhang、Jiuxi Chen
DOI:10.1021/acs.orglett.9b04185
日期:2020.2.21
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。