Copper-Catalyzed Regioselective Cascade Alkylation and Cyclocondensation of Quinoline <i>N</i>
-Oxides with Diazo Esters: Direct Access to Conjugated π-Systems
An inexpensive copper‐catalyzed cascade regioselective alkylation, followed by cyclocondensation of quinoline N‐oxides with α‐diazo esters has been achieved successfully to provide heteroarene‐containing conjugated π‐systems. The developed method is simple, straightforward, and economical with a broad range of substrate scope. The dual role of copper catalyst in the C−H bond functionalization and in