Synthesis of 3-phenylisoquinolones by reaction of simple pyrroline-2,3-diones with benzyne. New mechanistic considerations
摘要:
3-Phenylisoquinolones were obtained by cycloaddition of benzyne to 5-phenylpyrroline-2,3-diones. New mechanistic hypotheses for these transformations are discussed.
Disulfonimide‐Catalyzed Asymmetric Reduction of
<i>N</i>
‐Alkyl Imines
作者:Vijay N. Wakchaure、Philip S. J. Kaib、Markus Leutzsch、Benjamin List
DOI:10.1002/anie.201504052
日期:2015.9.28
A chiral disulfonimide (DSI)‐catalyzedasymmetric reduction of N‐alkyl imines with Hantzsch esters as a hydrogen source in the presence of Boc2O has been developed. The reaction delivers Boc‐protectedN‐alkyl amines with excellent yields and enantioselectivity. The method tolerates a large variety of alkyl amines, thus illustrating potential for a general reductive cross‐coupling of ketones with diverse
Tandem β-Alkylation−α-Arylation of Amines by Carbolithiation and Rearrangement of <i>N</i>-Carbamoyl Enamines (Vinyl Ureas)
作者:Jonathan Clayden、Morgan Donnard、Julien Lefranc、Alberto Minassi、Daniel J. Tetlow
DOI:10.1021/ja1007992
日期:2010.5.19
an umpolung fashion to the beta-carbon of N-carbamoyl enamines (N-vinyl ureas). The reaction proceeds with syn diastereospecificity and provides urea-stabilized, configurationally defined organolithiums. Facilitated by coordinating solvents (THF or DMPU), these undergo intramolecular attack on an N'-aryl group, resulting in retentive arylation of the organolithium and hence overall addition of an alkyl
The condensation of deoxybenzoin, phenylacetone, dibenzylketone and ethyl phenyl ketone with primary aromatic amines results in imines, which tautomerize partially in solution with measurable rate to the corresponding enamines. The condensation with methylamine produces instantly the isomer composition. In several cases the imines show syn-anti-isomerism. The structural dependence of the imine-enamine-equilibrium
Synthesis of arylimines from N-silylamides amd aryllithium compounds
作者:Ben L. Feringa、Johan F.G.A. Jansen
DOI:10.1016/s0040-4039(00)85517-3
日期:1986.1
Various arylimines were synthesized by the addition of N-silylated-N-alkyl-or N-aryl-amides to aryllithiumcompounds.
通过将N-甲硅烷基化的-N-烷基-或N-芳基-酰胺加到芳基锂化合物上来合成各种芳胺。
Geometry-Selective Synthesis of <i>E</i> or <i>Z</i> <i>N</i>-Vinyl Ureas (<i>N</i>-Carbamoyl Enamines)
作者:Julien Lefranc、Daniel J. Tetlow、Morgan Donnard、Alberto Minassi、Erik Gálvez、Jonathan Clayden
DOI:10.1021/ol1027442
日期:2011.1.21
N-Vinyl ureas are emerging as a valuable class of compounds with both nucleophilic and electrophilic reactivity. They may be made by capturing the enamine tautomer of an imine with an isocyanate, a reaction which in general leads to the E isomer of the vinyl urea. Deprotonation of such a vinyl urea, or of an allyl urea, generates a dipole stabilized Z-allyl anion which may be protonated to return the Z-vinyl urea. Isomerization of an allyl urea with a Ru complex provides an alternative route to E-vinyl ureas.