Copper-Mediated Synthesis of Substituted 2-Aryl-N-benzylbenzimidazoles and 2-Arylbenzoxazoles via C–H Functionalization/C–N/C–O Bond Formation
摘要:
An efficient method for the transformation of N-benzyl bisarylhydrazones and bisaryloxime ethers to functionalized 2-aryl-N-benzylbenzimidazoles and 2-arylbenzoxazoles is described. The protocol involves a copper(II)-mediated cascade C-H functionalization/C-N/C-O bond formation under neutral conditions. Substrates having either electron-donating or -withdrawing substituents undergo the cyclization to afford the target heterocycles at moderate temperature.
2-Arylsulphonyl-3-phenyloxaziridines: a new class of stable oxaziridine derivatives
作者:Franklin A. Davis、Upender K. Nadir、Edward W. Kluger
DOI:10.1039/c39770000025
日期:——
2-Arylsulphonyl-3-phenyloxaziridines (1a–d), a new class of stableoxaziridine derivatives, are prepared by oxidation of the corresponding N-benzylidenearenesulphenamides (2) or sulphonamides (3) with m-chloroperbenzoic acid.
The chemistry of trisulphenamides [N(SR)3]. Part III. Ionic and radical reactions of tribenzenesulphenamide [N(SPh)3]
作者:Joseph Almog、Derek H. R. Barton、Philip D. Magnus、Robert K. Norris
DOI:10.1039/p19740000853
日期:——
Tribenzenesulphenamide reacts with triphenylphosphine and other PIII species to give Wittig-type reagents. These furnish phenylthioimino-derivatives in reactions with unhindered, electrophilic carbonyl groups. Further aspects of the chemistry of the radical (PhS)2N· have been explored, in particular the formation of new functional group systems in reactions with arylhydrazones and with C-nitroso-compounds
β-Fluorinated amine is highly desirable for biological and pharmaceutical science, because replacing a C–H bond with a C–F bond can change the physical and chemical properties of the parent molecule to a large extent but not significantly alter its overall geometry. Herein, the highly stereoselective nucleophilic monofluoromethylation of imines have been developed. It is proposed that the chelated
Synthesis of <i>N</i>-Sulfenylimines from Disulfides and Primary Methanamines
作者:Robert Kawȩcki
DOI:10.1021/acs.joc.2c00415
日期:2022.6.3
N-Sulfenylimines (sulfenimines, thiooximes, N-alkylidenesulfenamides) were efficiently synthesized through the reaction of primary amines and disulfides with NBS or bromine. This reaction can be carried out in an open flask at room temperature without the need for any transition-metal-containing additives. The use of thiols instead of disulfides gave similar results. A wide range of amines were reacted