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
Aldehyde enolates III direct sulfenylation and iodination of aldehyde anions.
作者:P Groenewegen、H Kallenberg、A van der Gen
DOI:10.1016/s0040-4039(01)86424-8
日期:1979.1
Directly generated potassium enolates of aldehydes react with diphenyldisulfide to give the α-sulfenylated aldehydes. Reaction with iodine likewise provides the α-iodo aldehydes.
Addition of methoxy(phenylthio)methyllithium to ketones, followed by rearrangement of the adducts, provides a new method for the preparation of α-(phenylthio)aldehydes. The rearrangement is stereospecific.