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
Visible-Light-Promoted Intermolecular Oxidative Dearomatization of β-Naphthols with <i>N</i>
-Hydroxycarbamates
作者:Yuan-Zheng Cheng、Kai Zhou、Min Zhu、La-Ao-Chuan Li、Xiao Zhang、Shu-Li You
DOI:10.1002/chem.201803149
日期:2018.8.27
An intermolecular oxidative dearomatization of β‐naphthols with N‐hydroxycarbamates promoted by visible light was realized by means of photogenerated β‐naphthol radical cation intermediates. With a commercially available organic dye, the naphthalenones bearing a fully substituted stereogenic center were obtained with up to 92 % yield under aerobic conditions (26 examples). In addition, the rearrangement
通过光生β-萘酚自由基阳离子中间体实现了N-羟基氨基甲酸酯在β-萘酚的分子间氧化脱芳香化作用。使用可商购的有机染料,在有氧条件下以高达92%的产率获得带有完全取代的立体异构中心的萘酮(26个实例)。此外,仅在存在Cs 2 CO 3的情况下,才可以将CO偶联产物重排至CN偶联化合物。这种转化同时提供了一种吸引人的,合成上有用的方法来获得胺类脱芳香化化合物。
Copper-Catalyzed Aerobic Oxidation of <i>N</i>-Substituted Hydroxylamines: Efficient and Practical Access to Nitroso Compounds
作者:Charles P. Frazier、Alejandro Bugarin、Jarred R. Engelking、Javier Read de Alaniz
DOI:10.1021/ol301414k
日期:2012.7.20
A general and efficient aerobic oxidation of N-substituted hydroxylamines is described. The mild reaction conditions employed provide a catalytic and sustainable alternative to stoichiometric oxidation methods to gain access to a range of nitroso compounds, such as acylnitroso, nitrosoformate, nitrosoformamide, iminonitroso, arylnitroso, and P-nitrosophosphine oxide derivatives in excellent yield.