Copper Promoted 8-Aminoimidazo[1,2-a]pyridine-Directed Additive-Free Ortho C(sp²)–H C–S, C–Se Functionalization of (Hetero)Arenes

Abstract

Diaryl sulfides, diaryl selenides, and their derivatives are crucial scaffolds in the fields of organic chemistry and drug discovery. We report a practical and broadly applicable strategy for additive-free copper(II)-catalyzed ortho-sulfanylation and selanylation of β-C(sp²)–H bonds in (hetero)arenes, directed by 8-aminoimidazo[1,2-a]pyridine (8-AIP), a removable 6,5-fused bicyclic N,N-bidentate directing group. This protocol features mild reaction conditions that enable the formation of diverse functionalized thioethers and selenides using thiols, disulfides, and diselenides, with enhanced functional group tolerance and unique site-selectivity. The present protocol is reproducible in gram scale, and, in addition, we have also the showed cleavage of chelating auxiliary.

Keywords

C–H activation - ß-C(sp²)–H thiolation & selanylation - Additive free - Cu-catalysis - 8-AIP - Late-stage functionalization

Publication History

Received: 01 September 2025

Accepted after revision: 25 November 2025

Article published online:
09 December 2025

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