Umpolung Strategy for α‐Functionalization of Aldehydes for the Addition of Thiols and other Nucleophiles
作者:Jakob Blom、Gabriel J. Reyes‐Rodríguez、Henriette N. Tobiesen、Johannes N. Lamhauge、Marc V. Iversen、Casper L. Barløse、Niels Hammer、Matilde Rusbjerg、Karl Anker Jørgensen
DOI:10.1002/anie.201911793
日期:2019.12.2
Nucleophile-nucleophile coupling is a challenging transformation in organic chemistry. Herein we present a novel umpolung strategy for α-functionalization of aldehydes with nucleophiles. The strategy uses organocatalytic enamine activation and quinone-promoted oxidation to access O-bound quinol-intermediates that undergo nucleophilic substitution reactions. These quinol-intermediates react with different
Synthesis of Enantiomerically Enriched α-Sulfenylated Ketones and Aldehydes
作者:Joo-Hack Youn、Rudolf Herrmann、Ivar Ugi
DOI:10.1055/s-1987-27870
日期:——
α-Sulfenylated carbonyl compounds are prepared by the reaction of imines of aldehydes and ketones containing α-hydrogens with disulfides via the metalloenamines. With (R)-α-phenylethylamine as chiral auxiliary, enantiomeric excesses of 13-51% are observed.