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。
Controlling Asymmetric Remote and Cascade 1,3-Dipolar Cycloaddition Reactions by Organocatalysis
作者:Pernille H. Poulsen、Stefania Vergura、Alicia Monleón、Danny Kaare Bech Jørgensen、Karl Anker Jørgensen
DOI:10.1021/jacs.6b03546
日期:2016.5.25
The regio- and stereoselective control of cycloaddition reactions to polyconjugated systems has been demonstrated by applying asymmetric organocatalysis. Reaction of 2,4-dienals with nitrones allows for a highly regio- and stereoselective 1,3-dipolarcycloaddition in the presence of an aminocatalyst. The first cycloaddition on the remote olefin can be followed either by a cascade reaction or by other
1,3-Dipolar Cycloaddition Reactionsof Nitrones to Prop-1-ene-1,3-sultone
作者:Lun-Zu Liu、Li Tian、Guo-Yan Xu、Yong Ye
DOI:10.1055/s-2003-40201
日期:——
The reaction of prop-1-ene-1,3-sultone (1) with a variety of nitrones 2 afforded novel [3+2] cycloaddition products 3, 4, and 5 in good yield. Excellent regio- and stereoselectivity were achieved in the cycloaddition reaction with phenylnitrones.
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.
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