Nucleophilic amination of methoxypyridines by a sodium hydride–iodide composite
作者:Jia Hao Pang、Atsushi Kaga、Shunsuke Chiba
DOI:10.1039/c8cc05979a
日期:——
A new protocol for nucleophilic amination of methoxypyridines and their derivatives was developed using sodium hydride (NaH) in the presence of lithium iodide (LiI). The method offers a concise access to various aminopyridines which are potentially of medicinal interest.
Abstract The methoxy group is generally considered as a poor leavinggroup for nucleophilic substitution reactions. This work verified the superior ability of the methoxy group in nucleophilic amination of arenes mediated by the sodium hydride and lithium iodide through experimental and computational approaches. The methoxy group is generally considered as a poor leavinggroup for nucleophilic substitution
Pd-Catalyzed Ligand-Free Synthesis of Arylated Heteroaromatics by Coupling of <i>N</i>-Heteroaromatic Bromides with Iodobenzene Diacetate, Iodosobenzene, or Diphenyliodonium Salts
An efficient method for synthesizing arylated heteroaromatics has been reported via Pd-catalyzed ligand-free cross-coupling of N-heteroaromatic bromides with iodine(III) reagents under mild conditions. Iodobenzene diacetate, iodosobenzene, and diphenyliodonium salts act as ideal arylated sources in this reaction, producing bioactive aromatic-substituted pyridines and quinolines in moderate to high
Regioselective synthesis of 2,3-dihydrospiro[1,4]dioxino[2,3-b]pyridine derivatives
作者:Kurissery A. Tony、Santhosh Kumar Chittimalla、G. Abraham Rajkumar、Anjan Chakrabarti
DOI:10.1016/j.tetlet.2010.06.061
日期:2010.8
2-Chloropyridines and an aryl bromide underwent palladium-catalyzed intramolecular C–O bond forming reactions to provide 2,3-dihydrospiro[1,4]dioxino[2,3-b]pyridine derivatives and a benzodioxin, regioselectively.
2-氯吡啶和芳基溴经过钯催化的分子内C-O键形成反应,可选择性地提供2,3-二氢螺[1,4]二恶英[2,3- b ]吡啶衍生物和苯并二恶英。
Small organic molecules with tailored structures: initiators in the transition-metal-free C–H arylation of unactivated arenes
作者:Zhenghui Liu、Peng Wang、Yu Chen、Zhenzhong Yan、Suqing Chen、Wenjun Chen、Tiancheng Mu
DOI:10.1039/d0ra01845g
日期:——
to catalyze transition-metal-free C–H arylation of unactivated arenes with aryl iodides in the presence of tBuOK. In this article, an optimized catalytically active molecule, (2-(methylamino)phenyl)methanol, was designed. A broad range of aryl iodides could be converted into the corresponding arylated products at 100 °C over 24 h with good to excellent yields. Mechanistic experiments verified that radicals