Single-atom skeletal editing of 2H-indazoles enabled by difluorocarbene
作者:Yao Zhou、Fuling Chen、Ziru Li、Junjie Dong、Jingnan Li、Bohao Zhang、Qiuling Song
DOI:10.1007/s11426-023-1599-4
日期:2023.7
A novel difluorocarbene promoted single-atom skeletal editing of 2H-indazoles is demonstrated herein. Ethyl bromodifluoroacetate was severed as the difluorocarbene source in the current protocol, facilitating the cleavage of the N−N bond via carbon atom insertion. This metal-free ringexpansionreaction enables the late-stage diversification of indazole skeletons, assembling a diverse array of functionalized
Insights into Substrate Self-Assisted Activation of Allylic Alcohols Guiding to Mild Allylic Substitution of Tautomerizable Heteroarenes
作者:Qiuju Zhou、Lingyun Zheng、Bing Ma、Lijun Huang、Aoqi Liu、Xinhua Cao、Jing Yu、Xiantao Ma
DOI:10.1021/acs.joc.0c00094
日期:2020.4.3
A substrate self-assisted activation of allylic alcohols by tautomerizable heteroarenes via hydrogen bonding was disclosed by various NMR techniques, including variable-temperature(1)H NMR, Job plot, and H-1 NMR titration. Guided by these finding, a much milder allylic substitution of tautomerizable heteroarenes with allylic alcohols was developed, affording the target products in high yields.
Palladium-Catalyzed Allylic Amidation with N-Heterocycles via sp<sup>3</sup> C–H Oxidation
作者:Sandeep R. Vemula、Dinesh Kumar、Gregory R. Cook
DOI:10.1021/acscatal.6b01818
日期:2016.8.5
atom-economic direct intermolecular allylic amidation of electron-deficient tautomerizable N-heterocycles is reported via allylic C–H activation of terminal olefins with a PdCl2 catalyst. The reaction did not require any activators (base or Lewis acid) or external ligands and proceeded with high chemo- (N vs O), regio- (linear vs branched), and stereoselectivity (E vs Z) for a variety of N-heterocycles