Aroylnitrenes with singlet ground states: photochemistry of acetyl-substituted aroyl and aryloxycarbonyl azides
作者:Michael E. Sigman、Tom. Autrey、Gary B. Schuster
DOI:10.1021/ja00221a032
日期:1988.6
light gives only the aroylnitrenes. The tripletexcitedstates of the azides were detected chemically and by transient spectroscopic techniques. Nitrogen loss following near-UV irradiation occurs exclusively from the excitedtriplet azides. However, the chemicalproperties of ABN and ADN are consistent only with reactions originating from their singlet states. An ESR spectrum is observed at 8 K for
The photochemical metal‐free carboamidation of aryl radicals has been exploited for the preparation of aromatic amides, including hetero‐ and polyaromatic derivatives, under visible light irradiation of arylazo sulfones in the presence of isocyanides in aqueous acetonitrile. The process was useful for the smooth preparation of the antidepressant moclobemide.
Supported Palladium Nanoparticles that Catalyze Aminocarbonylation of Aryl Halides with Amines using Oxalic Acid as a Sustainable CO Source
作者:C. Bal Reddy、Shankar Ram、Ajay Kumar、Richa Bharti、Pralay Das
DOI:10.1002/chem.201900271
日期:2019.3.15
Polystyrene‐supported palladium (Pd@PS) nanoparticles (NPs) have been used to catalyze the aminocarbonylation of arylhalides with amines using oxalic acid as a CO source for the first‐time for the synthesis of amides. Furthermore, o‐iodoacetophenones participated in amidation and cyclization reactions to give isoindolinones in a single step following a concerted approach. Oxalic acid has been used
A case study of Pd⋯Pd intramolecular interaction in a benzothiazole based palladacycle; catalytic activity toward amide synthesis <i>via</i> an isocyanide insertion pathway
An acetate bridge benzothiazolepalladacycle containing a rare metallophilic intramolecular Pd⋯Pd interaction was synthesized and thoroughly characterized. The synthesized benzothiazolepalladacycle directly anchored on SBA-15 to form an efficient heterogeneous catalyst for amide synthesis via the migratory isocyanide insertion pathway.
Metal-Free Intermolecular Coupling of Arenes with Secondary Amides: Chemoselective Synthesis of Aromatic Ketimines and Ketones, and <i>N</i>-Deacylation of Secondary Amides
作者:Pei-Qiang Huang、Ying-Hong Huang、Kai-Jiong Xiao
DOI:10.1021/acs.joc.6b01647
日期:2016.10.7
The direct transformation of common secondary amides into aromatic ketimines and aromatic ketones with C–C bond formation is described. The reaction can also be used for N-deacylation of secondary amides to release amines. This method consists of in situ amide activation with triflic anhydride and intermolecular capture of the resulting highly electrophilic nitrilium intermediate with an arene. The