Visible-Light Photocatalyzed Deoxygenation of N-Heterocyclic <i>N</i>-Oxides
作者:Kyu Dong Kim、Jun Hee Lee
DOI:10.1021/acs.orglett.8b03446
日期:2018.12.7
operationally simple method is described that allows for the chemoselective deoxygenation of a wide range of N-heterocyclic N-oxides (a total of 36 examples). This visible-light-induced protocol features the use of only commercially available reagents, room-temperature conditions, and unprecedented chemoselective removal of the oxygen atom in a quinoline N-oxide in the presence of a pyridine N-oxide in the
Fast sulfonylation of pyridine/quinoline N-oxides induced by iodine is demonstrated herein. The regioselective protocol occurs under metal-free conditions in a short reaction time (10 min), exhibiting high efficiency (up to 92% yield) and good compatibility (up to 33 examples). A gram-scale reaction was conducted with only a slight loss of production.
Regioselective Metal-Free Cross-Coupling of Quinoline <i>N</i>-Oxides with Boronic Acids
作者:Luis Bering、Andrey P. Antonchick
DOI:10.1021/acs.orglett.5b01456
日期:2015.6.19
A novel and operationally simple one-step C-H bond functionalization of quinoline N-oxides to 2-substituted quinolines was developed. This approach enables the regioselective functionalization under external oxidant- and metal-free conditions. The developed transformation represents the first application of the Petasis reaction in functionalization of heterocycles.
2-Position-selective C H fluoromethylation of six-membered heteroaryl N-oxides with (fluoromethyl)triphenylphosphonium iodide