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。