Cu-Catalyzed Stereoselective γ-Alkylation of Enones
作者:Xiaohong Chen、Xiaoguang Liu、Justin T. Mohr
DOI:10.1021/jacs.6b02565
日期:2016.5.25
This method constitutes a novel approach to the challenging 1,6-dioxygenation motif. A range of γ-substituted enones, including many bearing all-carbon quaternary centers, are available through a simple protocol under mild reaction conditions with superb functional group compatibility. Excellent stereoinduction is observed providing controlled access to challenging stereochemical arrays.
Dichloromethane as a Chlorination Reagent for α-Bromocarbonyl Compounds in the Presence of a Copper Catalyst
作者:Kentaro Takeuchi、Syo Ishida、Takashi Nishikata
DOI:10.1246/cl.170062
日期:2017.5.5
We found that dichloromethane is a powerful chlorinatingreagent for the congested 3° and 2° Csp3–Br bond of α-bromocarbonyl amides, esters, and ketones. In the presence of an appropriate copper complex as a catalyst, the desired chlorination occurred within an hour. Control experiments revealed that in situ-generated CuCl2 is a key chlorinating agent that reacts with the 3° or 2° alkyl radicals generated
General Route for Preparing β-Nitrocarbonyl Compounds Using Copper Thermal Redox Catalysis
作者:Amber A. S. Gietter、Peter G. Gildner、Andrew P. Cinderella、Donald A. Watson
DOI:10.1021/ol5014153
日期:2014.6.6
Using a simple copper catalyst, the alkylation of nitroalkanes with α-bromocarbonyls is now possible. This method provides a general, functional group tolerant route to β-nitrocarbonyl compounds, including nitro amides, esters, ketones, and aldehydes. The highly sterically dense, functional group rich products from these reactions can be readily elaborated into a range of complex nitrogen-containing
Synthesis of Hindered Anilines: Three-Component Coupling of Arylboronic Acids, <i>tert</i>-Butyl Nitrite, and Alkyl Bromides
作者:David J. Fisher、James B. Shaum、C. Landon Mills、Javier Read de Alaniz
DOI:10.1021/acs.orglett.6b02523
日期:2016.10.7
The synthesis of sterically hindered amines has been a significant challenge in organic chemistry. Herein, we report a modular, three-component coupling that constructs two carbon–nitrogen bonds including a sterically hindered Csp3–N bond using commercially available materials. This process uses an earth-abundant copper catalyst and mild reaction conditions, allowing access to a variety of complex
Synthesis of Hindered α-Amino Carbonyls: Copper-Catalyzed Radical Addition with Nitroso Compounds
作者:David J. Fisher、G. Leslie Burnett、Rocío Velasco、Javier Read de Alaniz
DOI:10.1021/jacs.5b07860
日期:2015.9.16
The synthesis of sterically hindered anilines has been a significant challenge in organic chemistry. Here we report a Cu-catalyzed radical addition with in situ-generated nitrosocompounds to prepare sterically hindered amines directly from readily available materials. The transformation is conducted at room temperature, uses abundant copper salts, and is tolerant of a range of functional groups.
空间位阻苯胺的合成一直是有机化学中的一个重大挑战。在这里,我们报告了 Cu 催化的自由基加成与原位生成的亚硝基化合物,以直接从容易获得的材料制备位阻胺。转化在室温下进行,使用丰富的铜盐,并且可以耐受一系列官能团。