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Base-mediated chalcogenoaminative annulation of 2-alkynylanilines for direct access to 3-sulfenyl/selenyl-1H-indoles†
Wei-Ching Chen,Rekha Bai,Wan-Lin Cheng,Chun-Yu Peng,Daggula Mallikarjuna Reddy,Satpal Singh Badsara
Organic & Biomolecular Chemistry Pub Date : 03/15/2023 00:00:00 , DOI:10.1039/D3OB00279A
Abstract

An efficient and transition metal-free synthesis of 3-sulfenyl/selenyl-1H-indoles via a base-assisted chalcogenoaminative annulation of 2-alkynyl aniline with disulfides/diselenides is described. A series of 2-alkynylanilines were found compatible with dichalcogenides in this transformation providing 3-sulfenyl/selenyl-1H-indoles in good to excellent yields. The presented methodology has the advantages of easily available raw materials, functional group tolerance, and a wide range of substrates that provide access to 3-sulfenylindoles and 3-selenylindoles.

Graphical abstract: Base-mediated chalcogenoaminative annulation of 2-alkynylanilines for direct access to 3-sulfenyl/selenyl-1H-indoles
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