Sterically Controlled, Palladium-Catalyzed Intermolecular Amination of Arenes
作者:Ruja Shrestha、Paramita Mukherjee、Yichen Tan、Zachary C. Litman、John F. Hartwig
DOI:10.1021/ja4032677
日期:2013.6.12
the Pd-catalyzed amination of arenes to form N-aryl phthalimides with regioselectivity controlled predominantly by steric effects. Mono-, di-, and trisubstituted arenes lacking a directing group undergo amination reactions with moderate to high yields and high regioselectivities from sequential addition of PhI(OAc)2 as an oxidant in the presence of Pd(OAc)2 as catalyst. This sterically derived selectivity
Visible-Light-Driven C–H Imidation of Arenes and Heteroarenes by a Phosphonium Ylide Organophotoredox Catalyst: Application to C–H Functionalization of Alkenes
作者:Yasunori Toda、Toya Kobayashi、Fumiya Hirai、Takamichi Yano、Makoto Oikawa、Kimiya Sukegawa、Masahiro Shimizu、Fuyuki Ito、Hiroyuki Suga
DOI:10.1021/acs.joc.3c00988
日期:2023.7.7
Phosphonium ylide catalysis through an oxidative quenching cycle has been developed for visible-light-driven C–H imidation of arenes and heteroarenes. The present protocol could be applied not only to trihalomethylative lactonization reactions involving trifluoromethyl, trichloromethyl, and tribromomethyl radicals but also to the first example of an organophotoredox-catalyzed imidative lactonization
<i>N</i>-Acyloxyphthalimides as Nitrogen Radical Precursors in the Visible Light Photocatalyzed Room Temperature C–H Amination of Arenes and Heteroarenes
作者:Laura J. Allen、Pablo J. Cabrera、Melissa Lee、Melanie S. Sanford
DOI:10.1021/ja501906x
日期:2014.4.16
This paper reports a room temperature visible light photocatalyzed method for the C-H amination of arenes and heteroarenes. A key enabling advance in this work is the design of N-acyloxyphthalimides as precursors to nitrogen-based radical intermediates for these transformations. A broad substrate scope is presented, including the selective meta-amination of pyridine derivatives. A radical aromatic substitution mechanism is proposed.