irradiation in the presence of catalytic amounts of [(DPEphos)(bcp)Cu]PF6 and an amine, a range of unactivated aryl and alkyl halides were shown to be smoothly activated through a rare Cu(I)/Cu(I)*/Cu(0) catalytic cycle. This complex efficiently catalyzes a series of radical processes, including reductions, cyclizations, and direct arylation of arenes.
available catalysts based on inexpensive, environmentally benign base metals are therefore strongly needed. Furthermore, expanding the toolbox of methods based on photoredox catalysis will facilitate the discovery of new light-mediated transformations. This article details the use of a simple copper complex which, upon activation with blue light, can initiate a broad range of radicalreactions.
Intramolecular radical cyclization approach to access highly substituted indolines and 2,3-dihydrobenzofurans under visible-light
作者:Clarice A. D. Caiuby、Akbar Ali、Vinicius T. Santana、Francisco W. de S. Lucas、Marilia S. Santos、Arlene G. Corrêa、Otaciro R. Nascimento、Hao Jiang、Márcio W. Paixão
DOI:10.1039/c8ra01787e
日期:——
The combination of visible-light and tris(trimethylsilyl)silane promoting intramolecular reductive cyclization protocol for the synthesis of functionalized indolines and 2,3-dihydrobenzofurans has been developed. The transformations occur in the absence of transition metal and additional photocatalyst. In addition, quantum yield (Φ) was determined and electron paramagnetic resonance spectroscopy was
Synthesis of Indolines via a Photocatalytic Intramolecular Reductive Cyclization Reaction
作者:Akichika Itoh、Eiji Yamaguchi、Yumiko Goto
DOI:10.3987/com-19-s(f)8
日期:——
Herein, we synthesized a series of indolines using a photocatalytic intramolecular reductive cyclization reaction. This reaction uses several N-allyl-2-iodoanilines in the presence of 10-phenylphenothiazine (Ph-PTZ) as an organic photocatalyst. Further, the corresponding aryl radical is generated through the reductive cleavage of the C I bond, generating 5-exo cyclization products.