An efficient palladium nanoparticles-catalyzed N-arylation of sulfonamides and sulfonyl azides is described. This procedure serves as an active protocol for intermolecular C–N bond formation using Pd(OAc)2 in PEG-400 under air. Aryl bromides and triflates react at 35°C, while aryl chlorides require heating to 50°C and give the desired products only in low yields. This reaction proceeds smoothly in
quater‐heteroaryls have been prepared under indium catalysis by nucleophilicaromaticsubstitution (SNAr). This is the first example of catalytic heteroaryl–heteroaryl bond formation based on SNAr between two heteroaryl substrates without needing activating groups to enhance their reactivity (see scheme; El=electrophile, In=In(OTf)3 or In(ONf)3, Nu=nucleophile).
独特的性能:在铟催化下,通过亲核芳族取代(S N Ar)制备了二,三和四杂杂芳基。这是基于两个杂芳基底物之间基于S N Ar的催化杂芳基-杂芳基键催化形成的第一个示例,无需活化基团来增强其反应性(参见方案; El =亲电子试剂,In = In(OTf)3或In(ONf)3,Nu =亲核试剂)。
Sodium Hydride Induced N-Arylation of Diisopropyl Azodicarboxylate by Aryl Trifluoromethanesulfonates
method for intermolecular N-arylation of the anionic species derived from diisopropyl azodicarboxylate and sodiumhydride by aryl trifluoromethanesulfonates, in the presence of a ligand-free copper(I) oxide catalyst at 80 °C in N , N -dimethylformamide, is reported. A variety of functionalized aryl triflouromethanesulfonates were efficiently coupled by this method.
Development of a Suzuki Cross-Coupling Reaction between 2-Azidoarylboronic Pinacolate Esters and Vinyl Triflates To Enable the Synthesis of [2,3]-Fused Indole Heterocycles
作者:Navendu Jana、Quyen Nguyen、Tom G. Driver
DOI:10.1021/jo500252e
日期:2014.3.21
The scope and limitations of a Suzukireaction between 2-azidoarylboronic acid pinacolate esters and vinyl triflates are reported. This cross-couplingreaction enables the regioselective synthesis of indoles after a subsequent RhII2-catalyzed sp2-C–H bond amination reaction.