Electrophilic α-Amination Reaction of β-Ketoesters Using <i>N</i>-Hydroxycarbamates: Merging Aerobic Oxidation and Lewis Acid Catalysis
作者:David Sandoval、Charles P. Frazier、Alejandro Bugarin、Javier Read de Alaniz
DOI:10.1021/ja310784f
日期:2012.11.21
The copper-catalyzed α-amination of carbonyl compounds using nitrosoformate intermediates as the electrophilic source of nitrogen is reported. The reaction mergesaerobicoxidation and Lewis acid catalysis. The scope of the reaction is broad in terms of both the N-substituted hydroxylamines and the β-ketoesters. The new methodology harnesses the power of nitrosoformate intermediates and demonstrates
MgCl2-Catalyzed α-Amination of α-Alkyl-β-ketoesters via Oxidative N-Acylnitroso Aldol Reaction with Hydroxamic Acids
作者:Chong-Dao Lu、Ming-Qiang Liang
DOI:10.1055/s-0033-1340954
日期:——
A practical method for alpha-amination of alpha-alkyl-beta-ketoesters using hydroxamic acids is described. In this protocol, an oxidative N-acylnitroso aldol reaction is catalyzed by magnesium chloride in the presence of the oxidant tert-butyl hydroperoxide.
The Electrophilic α-Amination of α-Alkyl-β-Ketoesters with In Situ Generated Nitrosoformates
作者:Philipp Selig
DOI:10.1002/anie.201301282
日期:2013.7.8
Lewis acid and oxidation catalysis are merged in the reaction discussed here, which provides access to diversely substituted N‐hydroxycarbamates (see scheme). This reaction highlights the potential of nitrosoformates as electrophilic amination reagents as well as the benefits of aerobic oxidation for the formation of highly reactive species.