Tungsten-Catalyzed Transamidation of Tertiary Alkyl Amides
作者:Fang-Fang Feng、Xuan-Yu Liu、Chi Wai Cheung、Jun-An Ma
DOI:10.1021/acscatal.1c01840
日期:2021.6.18
chloride as a catalyst and chlorotrimethylsilane as an additive. The highly electrophilic and oxophilic tungsten catalyst enables the selective scission of a C–N bond of tertiary alkyl amides to effect transamidation of a myriad of structurally and electronically diverse tertiary alkyl amides and amines. Mechanistic study implies that the synergistic effect of the catalyst and the additive could pronouncedly
Chemoselective Intermolecular Cross-Enolate-Type Coupling of Amides
作者:Daniel Kaiser、Christopher J. Teskey、Pauline Adler、Nuno Maulide
DOI:10.1021/jacs.7b08813
日期:2017.11.15
A new approach for the synthesis of 1,4-dicarbonyl compounds is reported. Chemoselective activation of amide carbonyl functionality and subsequent umpolung viaN-oxide addition generates an electrophilic enolonium species that can be coupled with a wide range of nucleophilic enolates. The method conveys broad functional group tolerance on both components, does not suffer from formation of homocoupling
The use of readily available hydroxamic acids as reagents for the chemoselective (ortho‐amino)arylation of amides is described. This reaction proceeds under metal‐free, mild conditions, displays a very broad scope, and constitutes a direct approach for the metal‐free attachment of aniline residues to carbonyl derivatives.
Chemoselective α,β‐Dehydrogenation of Saturated Amides
作者:Christopher J. Teskey、Pauline Adler、Carlos R. Gonçalves、Nuno Maulide
DOI:10.1002/anie.201808794
日期:2019.1.8
We report a method for the selective α,β‐dehydrogenation of amides in the presence of other carbonyl moieties under mild conditions. Our strategy relies on electrophilic activation coupled to in situ selective selenium‐mediated dehydrogenation. The α,β‐unsaturated products were obtained in moderate to excellent yields, and their synthetic versatility was demonstrated by a range of transformations.
我们报告了一种在温和条件下在其他羰基存在下选择性 α,β-脱氢酰胺的方法。我们的策略依赖于亲电激活与原位选择性硒介导的脱氢作用相结合。α,β-不饱和产物以中等至优异的收率获得,并且它们的合成多功能性通过一系列转化得到证明。机理实验表明亲电子 Se IV物质的形成。
Flexible and Chemoselective Oxidation of Amides to α-Keto Amides and α-Hydroxy Amides
作者:Aurélien de la Torre、Daniel Kaiser、Nuno Maulide
DOI:10.1021/jacs.7b02983
日期:2017.5.17
A suite of flexible and chemoselective methods for the transition-metal-free oxidation of amides to α-keto amides and α-hydroxy amides is presented. These highly valuable motifs are accessed in good to excellent yields and stereoselectivities with high functional group tolerance. The utility of the method is showcased by the formal synthesis of a potent histone deacetylase inhibitor.