Copper-Catalyzed Annulative Amination of ortho-Alkynylphenols with Hydroxylamines: Synthesis of 3-Aminobenzofurans by Umpolung Amination Strategy
Koji Hirano*, Tetsuya Satoh and Masahiro Miura*
*Department of Applied Chemistry, Faculty of Engineering, Osaka University, Suita, Osaka 565-0871, Japan, Email: k_hiranochem.eng.osaka-u.ac.jp, miurachem.eng.osaka-u.ac.jp
K. Hirano, T. Satoh, M. Miura, Org. Lett., 2011, 13, 2395-2397.
DOI: 10.1021/ol200651r (free Supporting Information)
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A room temperature copper-catalyzed annulative amination of ortho-alkynylphenols with O-acylated hydroxylamines as electrophilic amination reagents proceeds efficiently to provide the corresponding 3-aminobenzofurans of biological and pharmaceutical interest.
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