第一个利用酰亚胺自由基的催化策略已经开发出来。这种方法可以通过光催化还原烯丙醇的肟酰亚胺酯来实现烯丙醇的烯烃双官能化。随后的亚氨酸酯自由基经历连续的分子内和分子间反应,通过三种不同的自由基机制提供(i)氢胺化、(ii)氨基烷基化或(iii)氨基芳基化。介绍了这种亚胺酯自由基反应催化方法的广泛范围和实用性,以及与其他 N 中心自由基和互补的闭壳亚胺酯途径的比较。
第一个利用酰亚胺自由基的催化策略已经开发出来。这种方法可以通过光催化还原烯丙醇的肟酰亚胺酯来实现烯丙醇的烯烃双官能化。随后的亚氨酸酯自由基经历连续的分子内和分子间反应,通过三种不同的自由基机制提供(i)氢胺化、(ii)氨基烷基化或(iii)氨基芳基化。介绍了这种亚胺酯自由基反应催化方法的广泛范围和实用性,以及与其他 N 中心自由基和互补的闭壳亚胺酯途径的比较。
1,2-<i>trans</i>-Stereoselective Synthesis of <i>C</i>-Glycosides of 2-Deoxy-2-amino-sugars Involving Glycosyl Radicals
作者:Wen-Ze Shi、Hai Li、Gui-Cai Mu、Ji-Liang Lu、Yuan-Hong Tu、Xiang-Guo Hu
DOI:10.1021/acs.orglett.1c00551
日期:2021.4.2
We report for the first time that the imidate radical can be efficiently added to glycals to generate glycosyl radicals, based on which a general, toxic-reagent-free synthesis of C-glycosides of 2-deoxy-2-amino sugars has been developed. Complementary to previous strategies, the reaction is 1,2-trans-stereoselective and could use aryl alkenes as substrates. The late-stage functionalization and density
Generation of 4′-Carbon Radicals via 1,5-Hydrogen Atom Transfer for the Synthesis of Bridged Nucleosides
作者:Yuta Ito、Koichi Mizuno、Sanae Sumise、Airi Kimura、Nozomi Noguchi、Yasufumi Fuchi、Yoshiyuki Hari
DOI:10.1021/acs.orglett.2c03285
日期:2022.10.21
The rapid and facile generation of 4′-carbon radicals from oxime imidates of nucleosides via 1,5-hydrogen atom transfer induced by iminyl radicals was developed. The cyclization of 4′-carbon radicals with olefins, followed by the hydrolysis of imidate residues, provided various 2′-O,4′-C- and 3′-O,4′-C-bridged nucleosides. This operationally simple approach can be applied to the few-step syntheses
开发了通过亚胺基自由基诱导的 1,5-氢原子转移从核苷的肟亚胺酸酯快速简便地生成 4'-碳自由基。4'-碳自由基与烯烃环化,随后亚胺酸酯残基水解,提供各种 2'- O ,4'- C - 和 3'- O ,4'- C -桥接核苷。这种操作简单的方法可应用于 6' S -methyl-2'- O ,4'- C -ethylene-bridged 5-methyluridine (6' S -Me-ENA-T) 和S -的几步合成限制性乙基桥连 5-甲基尿苷 ( S -cEt-T)。