Organic Photoredox Catalyzed Direct Hydroamination of Ynamides with Azoles

B Wang, GE Mccabe, MJ Parrish… - Advanced Synthesis …, 2022 - Wiley Online Library
B Wang, GE Mccabe, MJ Parrish, J Singh, M Zeller, Y Deng
Advanced Synthesis & Catalysis, 2022Wiley Online Library
Disclosed herein is a photoinduced selective hydroamination of ynamides with nitrogen
heteroaromatic nucleophiles. By using an organocatalytic photoredox system, a direct
method to construct a diverse of (Z)‐α‐azole enamides from ynamides and pyrazoles, as
well as triazoles, benzotriazoles, indazoles, and tetrazoles, is developed, thus providing a
photocatalytically synthetic route to heterocyclic motifs common in medicinal agents. Based
on the mechanistic studies, the hydroamination is postulated to operate via a mechanism in …
Abstract
Disclosed herein is a photoinduced selective hydroamination of ynamides with nitrogen heteroaromatic nucleophiles. By using an organocatalytic photoredox system, a direct method to construct a diverse of (Z)‐α‐azole enamides from ynamides and pyrazoles, as well as triazoles, benzotriazoles, indazoles, and tetrazoles, is developed, thus providing a photocatalytically synthetic route to heterocyclic motifs common in medicinal agents. Based on the mechanistic studies, the hydroamination is postulated to operate via a mechanism in which the single‐electron oxidation of ynamide and the intermediacy of an alkyne radical cation, is responsible for the observed reactivity.
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