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
Rh-Catalyzed Annulative Insertion of Terminal Olefin onto Pyridines via a C–H Activation Strategy Using Ethenesulfonyl Fluoride as Ethylene Provider
作者:Chen Li、Hua-Li Qin
DOI:10.1021/acs.orglett.9b01364
日期:2019.6.21
A Rh(III)-catalyzed annulative insertion of ethylene onto picolinamides was achieved, providing a portal to a class of unique pyridine-containing molecules bearing a terminal olefin moiety for diversification. Application of this method for modification of Sorafenib was also accomplished.
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。