Friedel–Crafts Amidoalkylation via Thermolysis and Oxidative Photocatalysis
作者:Chunhui Dai、Francesco Meschini、Jagan M. R. Narayanam、Corey R. J. Stephenson
DOI:10.1021/jo300162c
日期:2012.5.4
Friedel Crafts amidoalkylation was achieved by oxidation of dialkylamides using persulfate (S2O82-) in the presence of the visible light catalyst, Ru(bpy)(3)Cl-2, at room temperature, via a reactive N-acyliminium intermediate. Alternatively, mild heating of the dialkylamides and persulfate afforded a metal and Lewis acid-free Friedel-Crafts amidoalkylation. Alcohols and electron-rich arenes served as effective nucleophiles, forming new C-O or C-C bonds. In general, photocatalysis provided higher yields and better selectivities.
Photocatalyst-Free, Visible-Light-Mediated C(sp<sup>3</sup>)–H Arylation of Amides via a Solvent-Caged EDA Complex
作者:Jaspreet Kaur、Ahmed Shahin、Joshua P. Barham
DOI:10.1021/acs.orglett.1c00132
日期:2021.3.19
A photocatalyst-free and mild visible light photochemical procedure for C(sp3)–H arylation of amides is described. The reaction proceeds via an electrondonor–acceptor (EDA) complex between an electron-rich arene substrate and electron-poor persulfate oxidant. C(sp3)–H arylation of the amide occurs selectively with the most electron-rich arene of the substrate. Mechanistic studies corroborate the reaction