Phosphine/Photoredox Catalyzed Anti-Markovnikov Hydroamination of Olefins with Primary Sulfonamides via α-Scission from Phosphoranyl Radicals
作者:Alex J. Chinn、Kassandra Sedillo、Abigail G. Doyle
DOI:10.1021/jacs.1c09484
日期:2021.11.3
well-explored β-scission chemistry of phosphoranyl radicals, this strategy is applicable to activation of N-based nucleophiles and is catalytic in phosphine. We highlight application of this activation strategy to an intermolecular anti-Markovnikov hydroamination of unactivatedolefins with primary sulfonamides. A range of structurally diverse secondary sulfonamides can be prepared in good to excellent yields
从普通原料化学品中获取自由基的新策略具有广泛影响合成化学的潜力。我们报告了一种双膦和光氧化还原催化系统,该系统能够从伯磺酰胺中直接形成磺胺基自由基。机理研究支持 N 中心自由基是通过磷酰基自由基中间体的 P-N 键的 α 断裂产生的,该中间体由磺酰胺亲核加成到膦自由基阳离子形成。与最近充分探索的磷酰基自由基的 β- 断裂化学相比,该策略适用于 N 基亲核试剂的活化,并且在膦中具有催化作用。我们重点介绍了这种活化策略在未活化烯烃与伯磺酰胺的分子间抗马尔科夫尼科夫加氢胺化中的应用。
Photoredox-Mediated Remote C(sp<sup>3</sup>)–H Heteroarylation of <i>N</i>-Alkyl Sulfonamides
作者:Zhiqiang Deng、Guo-Xing Li、Gang He、Gong Chen
DOI:10.1021/acs.joc.9b02502
日期:2019.12.20
heteroarylation of sulfonyl-protected primary aliphaticamines with N-heteroarenes under photoredox-catalyzed conditions was developed. The reaction typically uses a slight excess of amine reactant. The use of benziodoxole acetate (BI-OAc) oxidant and hexafluoroisopropanol solvent is critical to achieve high yield. Besides methylene C-H bonds, heteroarylation reactions of δ methyl C-H bonds also worked under