Nair AM, Rahaman R, Patra J, Volla CMR. Dual Copper Photoredox C-H Alkynylation with Arylacetylenes.
Org Lett 2024. [PMID:
39255343 DOI:
10.1021/acs.orglett.4c02578]
[Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/12/2024]
Abstract
In the realm of organic synthesis, direct C-H alkynylation with arylacetylenes has remained a daunting challenge due to competing annulations or alkenylation. Addressing this long-standing issue, herein we demonstrate the merging of copper and photocatalysis to achieve the elusive C-H alkynylation of benzamides using arylacetylenes or arylpropiolic acids. Unlike conventional copper-mediated C-H activations, our protocol circumvents the need for high temperatures and stoichiometric amounts of copper salts or metal/non-metal oxidants. The versatility of the developed dual copper photoredox system is underscored by performing other diverse C-H functionalizations such as amination, selenylation, arylation, sulfonylation, and nitration under slightly modified conditions.
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