Synthesis of hindered alkyl aryl ether derivatives (R–O–Ar) remains a huge challenge and highly desirable in organic and medicinal chemistry because extensive substitution on the ether bond prevents the undesired metabolic process and thus avoids rapid degradation in vivo. Herein, we report an unprecedented hindered alkoxylation of picolinamide attached aromatic amines using economic copper salt and
Chelation-promoted Efficient C−H/N−H Cross Dehydrogenative Coupling between Picolinamides and Simple Ethers under Copper Catalysis
作者:Qiang Yue、Zhen Xiao、Zhengkun Kuang、Zhengding Su、Qian Zhang、Dong Li
DOI:10.1002/adsc.201701508
日期:2018.3.20
A highly efficient copper‐catalyzed C−H/N−H cross dehydrogenative coupling between picolinamides and simple ethers was developed. The reaction was promoted by the chelation assistance of removable picolinyl group and exhibited excellent TON and TOF number. This method was applicable to both N‐aryl and alkyl picolinamides as well as various cyclic and acyclic ethers with good functional group compatibility
N-picolinamides as ligands for Ullmann-type homocoupling reactions
作者:Fehmi Damkaci、Esra Altay、Matthew Waldron、Michael A. Knopp、David Snow、Nicholas Massaro
DOI:10.1016/j.tetlet.2013.11.111
日期:2014.1
The use of N-phenylpicolinamide (NPPA) as a ligand in Ullmann-type homocoupling reactions of aryl iodides and bromides in common solvents, such as DMF and MeCN has been successfully demonstrated at room temperature. In addition, this work provided the first example of the homocoupling of an aryl chloride at 82 °C, which is a relatively low temperature when compared to regular Ullmann reaction temperatures
Copper-catalyzed ortho-C–H amination of protected anilines with secondary amines
作者:Ángel Manu Martínez、Nuria Rodríguez、Ramón Gómez Arrayás、Juan C. Carretero
DOI:10.1039/c3cc49633c
日期:——
A practical Cu-catalyzed picolinamide-directed o-amination of anilines showing excellent mono-substitution selectivity and high functional group tolerance has been developed.
Copper-mediated ortho C H primary amination of anilines
作者:Tai-Jin Cheng、Xing Wang、Hui Xu、Hui-Xiong Dai
DOI:10.1016/j.tetlet.2021.153099
日期:2021.6
We report herein a copper-mediated ortho CH primary amination of anilines by using cheap and commercially available benzophenone imine as the amination reagent. The protocol show good functional group tolerance and heterocyclic compatibility. Late-stage diversification of drugs demonstrate the synthetic utility of this protocol.
我们在此报告了通过使用廉价且市售的二苯甲酮亚胺作为胺化试剂对苯胺进行铜介导的邻位C H 初级胺化。该协议显示出良好的官能团耐受性和杂环兼容性。药物的后期多样化证明了该协议的综合效用。