Visible-light-driven radical 1,3-addition of selenosulfonates to vinyldiazo compounds
作者:Weiyu Li、Lei Zhou
DOI:10.1039/d1gc02036f
日期:——
radical 1,3-selenosulfonylation of vinyldiazo compounds with selenosulfonates, providing various γ-seleno allylic sulfones in good yields. This photochemical reaction was carried out at room temperature in an open flask using ethyl acetate as the solvent without any photocatalysts or additives. The control experiments corroborated that the 1,3-addition proceeded via a radical-chain propagation process. The
Gold-Catalyzed Formal [3 + 3] and [4 + 2] Cycloaddition Reactions of Nitrosobenzenes with Alkenylgold Carbenoids
作者:Vinayak Vishnu Pagar、Appaso Mahadev Jadhav、Rai-Shung Liu
DOI:10.1021/ja209980d
日期:2011.12.28
We report two new formal cycloaddition reactions between nitrosobenzenes and alkenylgold carbenoids. We obtained quinoline oxides 3 in satisfactory yields from the gold-catalyzed [3 + 3]-cycloadditions between nitrosobenzenes and alkenyldiazo esters 1. For propargyl esters 5, its resulting gold carbenes react with nitrosobenzene to give alkenylimine 8, followed by a [4 + 2]-cycloaddition with nitrosobenzene
Intermolecular [5 + 1]-Cycloaddition between Vinyl Diazo Compounds and <i>tert</i>-Butyl Nitrite to 1,2,3-Triazine 1-Oxides and Their Further Transformation to Isoxazoles
作者:Luca De Angelis、Haifeng Zheng、Matthew T. Perz、Hadi Arman、Michael P. Doyle
DOI:10.1021/acs.orglett.1c02352
日期:2021.8.20
1,2,3-Triazine 1-oxides are formed by nitrosyl addition from tert-butyl nitrite to the vinylogous position of vinyl diazo compounds. This transformation, which is a formal intermolecular [5 + 1] cycloaddition, occurs under mild conditions, with high functional group tolerance and regioselectivity, and can be employed for late-stage functionalization. Upon heating at refluxing chlorobenzene temperature
B(C<sub>6</sub>F<sub>5</sub>)<sub>3</sub>-Catalyzed Diastereoselective and Divergent Reactions of Vinyldiazo Esters with Nitrones: Synthesis of Highly Functionalized Diazo Compounds
作者:Katarina Stefkova、Michael G. Guerzoni、Yara van Ingen、Emma Richards、Rebecca L. Melen
DOI:10.1021/acs.orglett.2c04198
日期:2023.1.27
transition-metal-free, highlydiastereoselectiveLewisacid catalyzed methodology toward the synthesis of isoxazolidine-based diazo compounds from the reaction between vinyldiazo esters and nitrones. Interestingly, the isoxazolidine products were identified to have contrasting diastereoselectivity to previously reported metal-catalyzed reactions. Furthermore, the same catalyst can be used with enol
在此,我们报告了一种温和的、不含过渡金属的、高度非对映选择性的路易斯酸催化方法,用于通过乙烯基重氮酯和硝酮之间的反应合成基于异恶唑烷的重氮化合物。有趣的是,异恶唑烷产物被认为具有与先前报道的金属催化反应相反的非对映选择性。此外,相同的催化剂可以与烯醇重氮酯一起使用,促进Mukaiyama-Mannich产物的形成。然后这些重氮产物可以进一步官能化以提供苯并[ b ]氮杂卓和吡咯烷酮衍生物。
Photoredox‐Enabled Self‐(3+2) Cyclization of Vinyldiazo Reagents: Synthesis of Cyclopentenyl <i>α</i>‐Diazo Compounds
作者:Weiyu Li、Sen Li、Claire Empel、Rene M. Koenigs、Lei Zhou
DOI:10.1002/anie.202309947
日期:2023.10.16
A novel self-(3+2) cycloaddition of vinyldiazo compounds is described, providing cyclopentene derivatives with conservation of one diazo functional group. The reaction involves an unprecedented single electron oxidation of vinyldiazo compounds using iridium photocatalysis.