Copper(II)-Catalyzed Synthesis of Sulfonyl-functionalized Quinone-fused Cyclopenta[b]indoles via Four-component Cascade Annulation

A copper-catalyzed four-component cascade annulation is realized to access novel sulfonyl-functionalized quinone-fused cyclopenta[b]indoles with high step economy and broad substrate scope, and 34 examples are constructed in one pot with...