Mizoroki-Heck Reactions Catalyzed by Dichloro{bis[1-(dicyclohexylphosphanyl)piperidine]}palladium: Palladium Nanoparticle Formation Promoted by (Water-Induced) Ligand Degradation
作者:Miriam Oberholzer、Roman Gerber、Christian M. Frech
DOI:10.1002/adsc.201100646
日期:2012.3
excellent functional group tolerance, which reliably operates at low catalyst loadings. Various activated, non‐activated, deactivated, functionalized, sterically hindered, and heterocyclic aryl bromides, which may contain nitro, chloro or trifluoromethane groups, nitriles, acetales, ketones, aldehydes, ethers, esters, lactones, amides, anilines, phenols, alcohols, carboxylic acids, and heterocyclic aryl
钯基二氯双[1-(二环己基膦酰基)哌啶]络合物– [(P (NC 5 H 10)(C 6 H 11)2 })2 Pd(Cl)2 ]易于从反应中定量获得N 2下的[Pd(cod)(Cl)2 ](cod = cycloocta-1,5-diene)与甲苯中两当量的1-(dicyclohexylphosphanyl)piperidine的合成在室温下仅需几分钟。该配合物是具有出色的官能团耐受性的高活性Heck催化剂,可在低催化剂负载下可靠地运行。各种活化的,未活化的,失活的,官能化的,位阻的和杂环的芳基溴化物,它们可能包含硝基,氯或三氟甲烷基团,腈,乙缩醛,酮,醛,醚,酯,内酯,酰胺,苯胺,苯酚,酚,醇,羧酸和杂环芳基溴化物(例如吡啶和衍生物)以及含有甲基硫烷基的噻吩和芳基溴化物已成功地与各种(也官能化的)烯烃偶联,并具有优异的收率和选择性(E-异构体通常是在140°C下在DMF中0.05 m