Photoinduced Acylations Via Azolium-Promoted Intermolecular Hydrogen Atom Transfer
作者:Joshua L. Zhu、Cullen R. Schull、Anthony T. Tam、Ángel Rentería-Gómez、Achyut Ranjan Gogoi、Osvaldo Gutierrez、Karl A. Scheidt
DOI:10.1021/jacs.2c12845
日期:2023.1.25
Photoinduced hydrogenatomtransfer (HAT) has been developed as a powerful tool to generate synthetically valuable radical species. The direct photoexcitation of ketones has been known to promote HAT or to generate acyl radicals through Norrish-type pathways, but these modalities remain severely limited by radical side reactions. We report herein a catalyst- and transition metal-free method for the
光致氢原子转移 (HAT) 已被开发为生成具有合成价值的自由基物种的强大工具。已知酮的直接光激发可促进 HAT 或通过 Norrish 型途径产生酰基自由基,但这些方式仍然受到自由基副反应的严重限制。我们在此报告了一种无催化剂和过渡金属的 C-H 键酰化方法,该方法利用了稳定、可分离的酰基唑鎓物种的独特性质。具体而言,酰基唑盐显示在 LED 照射下会发生分子间和区域选择性 HAT,一系列底物带有活性 C-H 键,随后形成 C-C 键以提供酮。