Les ions α-carbéniums benchrotréniques: mode de génération, exemples d'utilisation a la préparation d'amines, d'éthers et au contrôle stéréochimique lors d'attaques nucléophiles
作者:Siden Top、Gérard Jaouen
DOI:10.1016/s0022-328x(00)93566-6
日期:1980.9
Temporary complexation of benzylic alcohols by the Cr(CO)3 unit considerably enhances the stability of the carbeniumions generated from these alcohols and allows the preparation of amines, ethers by reaction of the ions with ammonia, amines or alcohols. This method also permits the total stereochemical control in the “exo” position of nucleophilicattack in the rigid series (indane, tetraline) and thus
Asymmetric Cross-Coupling of Aryl Triflates to the Benzylic Position of Benzylamines
作者:Genette I. McGrew、Corneliu Stanciu、Jiadi Zhang、Patrick J. Carroll、Spencer D. Dreher、Patrick J. Walsh
DOI:10.1002/anie.201201874
日期:2012.11.12
asymmetric cross‐coupling of benzyllithiums α to tertiaryaminesusing [Cr(CO)3] activation of benzylic CHbonds is described. The stabilized organolithium undergoes Pd‐catalyzed coupling with aryl triflates (ArOTf) by a novel dynamic kinetic resolution to yield enantioenriched diarylmethylamines. The chiral ligand for this reaction was identified using high‐throughput experimentation with 192 ligands