Metal-free C–H amination of arene with <i>N</i>-fluorobenzenesulfonimide catalysed by nitroxyl radicals at room temperature
作者:Qi Miao、Zhong Shao、Cuiying Shi、Lifang Ma、Fang Wang、Ruoqi Fu、Haochen Gao、Ziyuan Li
DOI:10.1039/c9cc02739d
日期:——
amination of arenethrough C–H bond cleavage employing N-fluorobenzenesulfonimide (NFSI) as the amination reagent in good to excellent yields with broad arene scope in the absence of any metal, ligand or additive is reported. Unlike previous transition metal-catalysed aminations in which high reaction temperatures are usually necessary, this novel reaction at room temperature is the first example of C–H
DDQ-promoted direct C5-alkylation of oxazoles with alkylboronic acids via palladium-catalysed C–H bond activation
作者:Bowen Lei、Xiaojiao Wang、Lifang Ma、Huixuan Jiao、Lisi Zhu、Ziyuan Li
DOI:10.1039/c7ob01083d
日期:——
A novel and concise C5-alkylation of oxazole using alkylboronic acids as the alkyl donor via Pd(II)-catalysed C-H bond activation has been achieved in moderate to good yields with satisfactory functional group tolerance. Instead of commonly used BQ as a key promoter, DDQ was discovered to be a better additive that significantly promoted this alkylation. This efficient and advanced method represents
Iron-catalyzed C(5)−H Imidation of Azole with <i>N</i>
-Fluorobenzenesulfonimide
作者:Xiaojiao Wang、Bowen Lei、Lifang Ma、Huixuan Jiao、Wenhua Xing、Jiaming Chen、Ziyuan Li
DOI:10.1002/adsc.201701124
日期:2017.12.19
An iron(II)‐catalyzed direct imidation of oxazole and thiazole with N‐fluorobenzenesulfonimide (NFSI) through C(5)−H bond cleavage is disclosed, providing C5‐imidated azoles in moderate to excellent yields with broad substrate scope. This reaction represents the first iron‐catalyzed C−Himidation of arene where NFSI serves as the imidation reagent, and potentially constitutes an efficient access to
Nickel peroxide dehydrogenation of oxygen-, sulfur-, and nitrogen-containing heterocycles
作者:David L. Evans、David K. Minster、Ulrich Jordis、Sidney M. Hecht、Arthur L. Mazzu、A. I. Meyers
DOI:10.1021/jo01318a005
日期:1979.2
Synthesis of Functionalized Oxazolines and Oxazoles with DAST and Deoxo-Fluor
作者:Andrew J. Phillips、Yoshikazu Uto、Peter Wipf、Michael J. Reno、David R. Williams
DOI:10.1021/ol005777b
日期:2000.4.1
[formula: see text] A mild and highly efficient cyclization of beta-hydroxy amides to oxazolines is described using DAST and Deoxo-Fluor reagents. A one-pot protocol for the synthesis of oxazoles from beta-hydroxy amides is also presented.