Synthesis of Chromeno[3,4-c]pyridines by Rhodium(III)-Catalyzed Annulation of Coumarinyl Ketoxime Esters and Alkynes
作者:Jiang-Sheng Li、Xin-Yun Xie、Qian Yang、Pan-Pan Yang、Si Jiang、Zhi-Wei Li、Cui-Hong Lu、Wei-Dong Liu
DOI:10.1016/j.tet.2019.07.002
日期:2019.8
An efficient, scalable synthetic method of chromeno[3,4-c]pyridine scaffolds through redox-neutral [4 + 2] annulation between coumarinyl ketoxime esters and internal alkynes has been developed using the rhodium(III) catalytic system. The present transformation proceeds under mild conditions, features good functional group compatibility and obivates the use of external oxidants. Ready access to pyridine
通过使用铑(III)催化体系,开发了一种通过氧化还原中性[4 + 2]香豆素基酮肟酯和内部炔烃的氧化还原[3,4- c ]吡啶骨架的高效,可扩展的合成方法。本发明的转化在温和的条件下进行,具有良好的官能团相容性,并且无需使用外部氧化剂。举例说明容易获得带有三个碳取代基的吡啶衍生物。