Synthesis of<i>N</i>-Aryl Pyridin-2-ones via Ligand Coupling Reactions Using Pentavalent Organobismuth Reagents
作者:Kazuhiro Ikegai、Teruaki Mukaiyama
DOI:10.1246/cl.2005.1496
日期:2005.11
An efficient method for the synthesis of N-aryl pyridin-2-ones was established by way of ligand coupling reactions using pentavalentorganobismuthreagents such as triarylbismuth dichlorides.
N- and O-arylation reactions of pyridin-2-ones as ambidentnucleophiles have been achieved with diaryliodonium salts on the basis of base-dependent chemoselectivity. In the presence of N,N-diethylaniline in fluorobenzene, pyridin-2-ones were very selectively converted to N-arylated products in high yields. On the other hand, the O-arylation reactions smoothly proceeded with the use of quinoline in chlorobenzene
<i>N</i>-Arylation of Pyridin-2(1<i>H</i>)-ones with Pentavalent Organobismuth Reagents under Copper-Free Conditions
作者:Kazuhiro Ikegai、Yuzo Nagata、Teruaki Mukaiyama
DOI:10.1246/bcsj.79.761
日期:2006.5
and the related heteroaromatic lactams has been established via ligand-coupling reactions using tri- or tetra-aryl organobismuth(V) reagents such as triarylbismuth dichlorides. Also, N-alkenylation of pyridin-2(1H)-one was achieved similarly by using alkenyltriarylbismuth(V) reagents.
Palladium-Catalyzed Weak Chelation-Assisted Site-Selective C–H Arylation of N-Aryl Pyridones via 2-fold C–H Activation
作者:Maniya V. Nanjegowda、Shubhajit Basak、Tripti Paul、Tharmalingam Punniyamurthy
DOI:10.1021/acs.joc.4c00216
日期:2024.5.3
Palladium-catalyzed weak chelation-assisted oxidative cross-dehydrogenativecoupling of arenes has been accomplished. The use of medicinally important pyridones as the intrinsic directing group, regioselectivity, 2-fold C–H activation, and late-stage modification of bioactive compounds are the important practical features.
An improved Ullmann–Ukita–Buchwald–Li conditions for CuI-catalyzed coupling reaction of 2-pyridones with aryl halides
作者:Po-Shih Wang、Chih-Kai Liang、Man-kit Leung
DOI:10.1016/j.tet.2005.01.063
日期:2005.3
An effective CuI-trans-N,N'-dimethylcyclohexane-1,2-diamine (DMCDA)-K2CO3-cataIyzed coupling reaction of 2-pyridones with aryl halides is described. Under our conditions, DMCDA was found to be an effective catalyst that facilitates the coupling reactions even in toluene, a common industrial solvent. In addition, 3-bromopyridine could also be coupled effectively under these conditions, indicating that the catalytic reactivity of this system is high. The reaction could be applied for polymer modification and iterative oligo-pyridone synthesis. (c) 2005 Elsevier Ltd. All rights reserved.