Cycloadducts of nitrones with isocyanates; 1,2,4- or 1,3,4-oxadiazolidinones?
作者:Anthony M. T. Bell、Jonathan Bridges、Richard Cross、Christopher P. Falshaw、Brian F. Taylor、Giles A. Taylor、Ian C. Whittaker、Michael J. Begley
DOI:10.1039/p19870002593
日期:——
The adducts formed between various aryl-substituted nitrones and aryl isocyanates have been shown, using 15N n.m.r. spectroscopy and X-ray crystallography, to be substituted 1,2,4-oxadiazolidinones and not the previously reported 1,3,4-oxadiazolinones.
使用15 N nmr光谱法和X射线晶体学显示,各种芳基取代的硝酮与芳基异氰酸酯之间形成的加合物被取代的1,2,4-恶二唑烷酮,而不是先前报道的1,3,4-恶二唑啉酮。
Trifluoromethyl Vinyl Sulfide: A Building Block for the Synthesis of CF<sub>3</sub>S-Containing Isoxazolidines
作者:Alejandra Riesco-Domínguez、Jeroen van de Wiel、Trevor A. Hamlin、Bas van Beek、Stephen D. Lindell、Daniel Blanco-Ania、F. Matthias Bickelhaupt、Floris P. J. T. Rutjes
DOI:10.1021/acs.joc.7b02639
日期:2018.2.16
Trifluoromethyl vinyl sulfide, a potential building block for pharmaceutically and agrochemically relevant products, is prepared and used for the first time in high-pressure-mediated 1,3-dipolar cycloaddition reactions with nitrones to synthesize (trifluoromethyl)sulfanyl isoxazolidines.
Iridium-Catalyzed Redox-Neutral C2 and C3 Dual C–H Functionalization of Indoles with Nitrones toward 7<i>H</i>-Indolo[2,3-<i>c</i>]quinolines
作者:Miao Li、Yaqun Dong、Cong Zhou、Junxue Bai、Jiang Cheng、Jianwei Sun、Song Sun
DOI:10.1021/acs.orglett.1c02975
日期:2021.11.5
An iridium-catalyzed redox-neutral C-2 and C-3 dualC–Hfunctionalization of indoles with nitrones has been developed, furnishing a range of 7H-indolo[2,3-c]quinolines with high efficiency and regioselectivity under mild reaction conditions. Notably, sequential multiple C–H bond cleavage and C–C bond formation constitute the key events of this process, in which nitrone serves as a building block and
已开发出铱催化氧化还原中性 C-2 和 C-3 双 C-H 官能化吲哚与硝酮,提供一系列 7 H-吲哚[2,3- c ]喹啉,在温和的条件下具有高效率和区域选择性反应条件。值得注意的是,连续的多重 C-H 键断裂和 C-C 键形成构成了该过程的关键事件,其中硝酮作为构建块和氧化剂。与之前的 7 H-吲哚并[2,3- c ]喹啉方法不同,这种新开发的反应具有容易获得的底物、操作简单、范围广、效率高到高和优异的区域选择性。
Reaction of Azomethine<i>N</i>-Oxides. III. Reactions of Some Azomethine<i>N</i>-Oxides with Fluoranil, Phenyl Vinyl Sulfone, and β-Nitrostyrene
作者:Ahmed Moukhtar Nour El-Din
DOI:10.1246/bcsj.59.1239
日期:1986.4
Isomerization of 3H-indole 1-oxides in the presence of tetrafluoro-2,5-cyclohexadiene-1,4-dione (fluoranil) to the thermodynamically more stable lactams was found to proceed via formation of charge-transfer complexes. However, addition of fluoranil to some open chain nitrones did not give the corresponding amides. Both electron-deficient β-nitrostyrene and phenyl vinylsulfone did not form charge-transfer
Gold(I)-Catalyzed [4 + 2] Annulation between Arylynes and C,N-Diaryl Nitrones for Chemoselective Synthesis of Quinoline Scaffolds via Gold Acetylide Intermediates
作者:Debashis Barik、Rai-Shung Liu
DOI:10.1021/acs.joc.2c00274
日期:2022.6.3
Gold-catalyzed synthesis of quinoline derivatives via [4 + 2] annulation between terminal arylynes and nitrones is described. Our mechanistic analysis supports the participation of alkynylgold intermediates, instead of a typical gold–carbene species in recently reported gold catalysis. These nucleophilic alkynylgold species react with nitrones via Povarov-type reactions. Cheap, readily available materials