Aromatic CC Bonds as Dipolarophiles: Facile Reactions of Uncomplexed Electron-Deficient Benzene Derivatives and Other Aromatic Rings with a Non-Stabilized Azomethine Ylide
作者:Sunyoung Lee、Sonia Diab、Pierre Queval、Muriel Sebban、Isabelle Chataigner、Serge R. Piettre
DOI:10.1002/chem.201201238
日期:2013.5.27
Non‐stabilized azomethineylide 4 a reacts smoothly at room temperature with a variety of uncomplexed aromatic heterocycles and carbocycles on the condition that the ring contains at least one or two electron‐withdrawing substituents, respectively. Aromatic substrates, including pyridine and benzene derivatives, participate as 2 π components in [3+2] cycloaddition reactions and interact with one, two
Comparison of the reactivity between 2- and 3-nitropyrroles in cycloaddition reactions. A simple indole synthesis
作者:Claudia Della Rosa、Maria Kneeteman、Pedro Mancini
DOI:10.1016/j.tetlet.2006.12.097
日期:2007.2
N-Tosyl-2-nitropyrroles react at high temperature with poorly and strongly activated dienes. They exhibit a dienophilic character similar to N-tosyl-3-nitropyrroles producing the corresponding indoles through a classical Diels–Alder process. A similar behaviour was observed in disubstituted N-tosyl-pyrroles.
Facile Dearomatization of Nitrobenzene Derivatives and Other Nitroarenes with N-Benzyl Azomethine Ylide
作者:Sunyoung Lee、Isabelle Chataigner、Serge R. Piettre
DOI:10.1002/anie.201005779
日期:2011.1.10
Breaking the aromaticity barrier: Nitrobenzenederivatives and othernitroarenes smoothly react at room temperature with an azomethineylide to yield polycyclic adducts in high yields (see scheme; Bn=benzyl, TFA=trifluoroacetic acid). This unprecedented loss of aromaticity delivers scaffolds prone to a number of potentially interesting derivatizations.
Microwave-assisted reactions of nitroheterocycles with dienes. Diels–Alder and tandem hetero Diels–Alder/[3,3] sigmatropic shift
作者:M. Victoria Gómez、Ana I. Aranda、Andrés Moreno、Fernando P. Cossío、Abel de Cózar、Ángel Díaz-Ortiz、Antonio de la Hoz、Pilar Prieto
DOI:10.1016/j.tet.2009.04.065
日期:2009.7
the pyrazolate ion, as elucidated by computational studies. Reaction of nitroindole 1 with cyclohexadiene 2 afforded exclusively the endo stereoisomer (10endo) in a tandem hetero Diels–Alder/[3,3] sigmatropicshift, as determined by computational calculations.
Multicomponent Domino [4+2]/[3+2] Cycloadditions of Nitroheteroaromatics: An Efficient Synthesis of Fused Nitrogenated Polycycles
作者:Isabelle Chataigner、Serge R. Piettre
DOI:10.1021/ol701608b
日期:2007.10.1
pressure allows 3-nitroindole and 3-nitropyrrole derivatives to behave as electron-poor heterodienes in multicomponent domino [4+2]/[3+2] cycloaddition processes. The primary [4+2] inverse demand cycloaddition appears to be completely endo selective, while the subsequent [3+2] process shows a total facial selectivity, setting the stereochemistry at ring junction, and an endo/exo selectivity depending