Umpolung Strategy for α-Functionalization of Aldehydes for the Addition of Thiols and other Nucleophiles
Enviado por Gabriel J. Reyes-Rodríguez el
Título | Umpolung Strategy for α-Functionalization of Aldehydes for the Addition of Thiols and other Nucleophiles |
Publication Type | Journal Article |
Year of Publication | 2019 |
Autores | Blom, J, Reyes-Rodríguez, GJ, Tobiesen, HN, Lamhauge, JN, Iversen, MV, Barløse, CL, Hammer, N, Rusbjerg, M, Jørgensen, KA |
Journal | Angewandte Chemie, International Edition |
Volume | 58 |
Issue | 49 |
Start Page | 17856 |
Date Published | 12/2019 |
Abstract | 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 classes of nucleophiles. The focus is on an unprecedented organocatalytic oxidative α-thiolation of aldehydes. The reaction scope is demonstrated for a broad range of thiols and extended to chemoselective bioconjugation, and applicable to a large variety of aldehydes. This strategy can also encompass organocatalytic enantioselective coupling of α-branched aldehydes with thiols forming quaternary thioethers. Studies indicate a stereoselective formation of the intermediate followed by a stereospecific nucleophilic substitution reaction at a quaternary stereocenter, with inversion of configuration. |
URL | https://onlinelibrary.wiley.com/doi/abs/10.1002/anie.201911793 |
DOI | 10.1002/anie.201911793 |
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