Interrupted Fischer-Indole Intermediates via Oxyarylation of Alkenyl Boronic Acids
作者:Heng-Yen Wang、Laura L. Anderson
DOI:10.1021/ol401416r
日期:2013.7.5
The oxyarylation of alkenylboronicacids with N-arylbenzhydroxamic acids has been achieved under both copper-mediated and copper-catalyzed conditions to provide access to interrupted Fischer-indole intermediates. This transformation is believed to proceed through a copper-promoted C–O bond forming event followed by a [3,3] rearrangement. The scope of the method is described and mechanistic experiments
Diastereoselective Synthesis of Nine-Membered Heterocycles <i>via</i>
the Cycloaddition and Sequential Rearrangement of <i>N</i>
-Vinyl Nitrones with Isocyanates
作者:Ning Zou、Ji-Wen Jiao、Yu Feng、Chun-Hua Chen、Cui Liang、Gui-Fa Su、Dong-Liang Mo
DOI:10.1002/adsc.201700685
日期:2017.10.25
A metal‐free construction of highly diastereoselective nine‐membered heterocycles is described via the cycloaddition and rearrangement of N‐vinyl‐α,β‐unsaturated ketonitrones and isocyanates. Notably, the prepared nine‐membered heterocycles afforded 2,3‐dihydropyrrolizines under heating conditions. Mechanisticstudies showed that the nine‐membered rings might undergo decarboxylation, isomerization
Generation and Radical–Radical Cross-Coupling of Alkenyloxy Radical
作者:Yunquan Man、Bo Xu
DOI:10.1021/acs.orglett.4c00627
日期:2024.3.29
the alkene moiety. The direct radical–radical cross-coupling of O radicals is also challenging (limited to N–O bond formation) because of the lack of suitable persistent radical species. This study demonstrated the feasibility of using Breslow intermediate radical (BIR) as a persistent radical to capture unstable π-conjugated O radicals and allow the C–O radical–radical cross-coupling.
烯烃连接的氧自由基很少使用,因为高反应性氧自由基与烯烃部分不相容。由于缺乏合适的持久性自由基种类,O自由基的直接自由基-自由基交叉偶联也具有挑战性(仅限于N-O键的形成)。这项研究证明了使用 Breslow 中间自由基 (BIR) 作为持久自由基来捕获不稳定的 π-共轭 O 自由基并允许 C-O 自由基-自由基交叉偶联的可行性。