Davis–Beirut Reaction: A Photochemical Brønsted Acid Catalyzed Route to <i>N</i>-Aryl 2<i>H</i>-Indazoles
作者:Niklas Kraemer、Clarabella J. Li、Jie S. Zhu、Julio M. Larach、Ka Yi Tsui、Dean J. Tantillo、Makhluf J. Haddadin、Mark J. Kurth
DOI:10.1021/acs.orglett.9b02213
日期:2019.8.2
The Davis–Beirut reaction provides access to 2H-indazoles fromaromatic nitro compounds. However, N-aryl targets have been traditionally challenging to access due to competitive alternate reaction pathways. Previously, the key nitroso imine intermediate was generated under alkaline conditions, but as reported here, the photochemistry of o-nitrobenzyl alcohols empowered Brønsted acid catalyzed conditions