<i>ortho</i>
‐Alkylation of Pyridine
<i>N</i>
‐Oxides with Alkynes by Photocatalysis: Pyridine
<i>N</i>
‐Oxide as a Redox Auxiliary
作者:Jonathan P. Markham、Ban Wang、Edwin D. Stevens、Stuart C. Burris、Yongming Deng
DOI:10.1002/chem.201901065
日期:2019.5.7
A photocatalyzed ortho‐alkylation of pyridine N‐oxide with ynamides and arylacetylenes has been developed, which yields a series of α‐(2‐pyridinyl) benzyl amides/ketones. Mechanistic studies, including electrochemical studies, radical‐trapping experiments, and Stern–Volmer fluorescence quenching studies demonstrate that pyridine N‐oxide serves as both a redox auxiliary and radical acceptor to achieve