The Direct C–H Difluoromethylation of Heteroarenes Based on the Photolysis of Hypervalent Iodine(III) Reagents That Contain Difluoroacetoxy Ligands
作者:Ryu Sakamoto、Hirotaka Kashiwagi、Keiji Maruoka
DOI:10.1021/acs.orglett.7b02416
日期:2017.10.6
In this letter, an efficient method for the photolytic generation of difluoromethyl radicals from [bis(difluoroacetoxy)iodo]benzene reagents is described. The present approach enables the introduction of difluoromethyl groups into various heteroarenes under mild conditions in the absence of any additional reagents or catalysts.
Preparation of Heteroaromatic (Aryl)iodonium Imides as I−N Bond-Containing Hypervalent Iodine
作者:Kazuma Ishida、Hideo Togo、Katsuhiko Moriyama
DOI:10.1002/asia.201601349
日期:2016.12.19
Hypervalent iodine(III) compounds containing iodine–nitrogen bonds are very attractive amination reagents in organic synthesis. Heteroaromatic (aryl)iodonium imidescontaining a iodine–nitrogen bond and a hypervalent iodine(III) atom were prepared from heteroarenes, bis(sulfon)imides and (diacetoxyiodo)arenes under mild conditions. These compounds were stable under air and in organic solvents, and
Copper-Catalyzed Indole-Selective C–N Coupling Reaction of Indolyl(2-alkoxy-phenyl)iodonium Imides: Effect of Substituent on Iodoarene as Dummy Ligand
作者:Kazuhiro Watanabe、Katsuhiko Moriyama
DOI:10.1021/acs.joc.8b02676
日期:2018.12.7
A monoalkoxy phenyl group as a dummy ligand on indolyl(aryl)iodonium imides, which is related to the N–I bonding hypervalent iodine(III) compound, for the copper-catalyzed indole-selective C–N coupling reaction was designed to provide 3-bissulfonimido-indole derivatives in high yields. In particular, the use of indolyl(2-butoxylphenyl)iodonium bissulfonimides indicated the high indole selectivity.
Transition-metal-free synthesis of thiocyanato- or nitro-arenes through diaryliodonium salts
作者:Xiao-Hua Li、Liang-Gui Li、Xue-Ling Mo、Dong-Liang Mo
DOI:10.1080/00397911.2016.1181764
日期:2016.6.2
ABSTRACT A transition-metal-free approach to facile synthesis of thiocyanato- and nitro-arenes was developed from KSCN (potassiumthiocyanate) or NaNO2 with diaryliodonium salts in good yields under mild conditions. The reaction was compatible with a variety of sensitive functional substituents such as halides and nitro and ester groups. The usefulness of arylation products has been realized. GRAPHICAL
Here we describe an asymmetric [3,3]-sigmatropicrearrangement of aryl iodanes that enables the enantioselective α-arylation of chiral 2-oxazolines, thereby producing valuable, chiral α-aryl carbonyl compounds. The success of this protocol hinges on the selective assembly of aryl iodanes with 2-oxazolines and the smooth deprotonation of the in situ generated iodonium-imine species. The nearly neutral