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。
[EN] 2-CYANOPYRROLOPYRIMIDINES AND PHARMACEUTICAL USES THEREOF<br/>[FR] 2-CYANOPYRROLOPYRIMIDINES ET UTILISATIONS PHARMACEUTIQUES DE CELLES-CI
申请人:NOVARTIS AG
公开号:WO2004069256A1
公开(公告)日:2004-08-19
The invention relates to pyrrolo pyrimidines of formula (I), wherein Y represents -(CH2)t-O- or -(CH2)r-S-, p is 1 or 2, r is 1, 2 or 3, t is 1, 2 or 3, or Y is -(CH2)j- or -CH=CH-, j is 1 or 2; p is 1 or 2, or Y is -(CH2)f-, f is 1 or 2, p is 1, and the further radicals and symbols have the meaning as defined herein; their preparation, their use as pharmaceuticals, pharmaceutical compositions containing them, the use of such a compound for the manufacture of a pharmaceutical preparation for the treatment of neuropathic pain and to a method for the treatment of such a disease in animals, especially in humans.
Catalytic Radical Trifluoromethylalkynylation of Unactivated Alkenes
作者:Shaofang Zhou、Tao Song、He Chen、Zhonglin Liu、Haigen Shen、Chaozhong Li
DOI:10.1021/acs.orglett.6b03870
日期:2017.2.3
The trifluoromethylalkynylation of unactivatedalkenes with alkynyl sulfones and Togni’s reagent was developed. The reaction was catalyzed by 2,4,6-trimethylpyridine, leading to various β-trifluoromethylated alkynes under metal-free conditions with a broad substrate scope and wide functional group compatibility. A mechanism involving catalytic nonchain radical processes is proposed.
Remote and Proximal Hydroaminoalkylation of Alkenes Enabled by Photoredox/Nickel Dual Catalysis
作者:Songlin Zheng、Wenlong Wang、Weiming Yuan
DOI:10.1021/jacs.2c08039
日期:2022.10.5
hydroaminoalkylation of activated alkenes that provides the β-selective products. The chain-walking of a Ni–H intermediate toward a carbonyl allows for the hydroaminoalkylation of unactivated alkenes at remote sp3 C–H sites. This method tolerates a broad substrate scope of both amines and alkenes as well as providing a streamlined synthesis of value-added β-amino acid derivatives from readily available
A Ru(II)-catalyzed C–H alkenylation of benzimidates with unactivated alkenes providing ortho-alkenylated benzonitriles in good to excellent yields in a highly regio- and stereoselective manner is described. In the reaction, an imidate group converted into a nitrile under the reaction conditions. The alkenylation reaction was compatible with various substituted benzimidates as well as functionalized