We have developed a convenient one-step preparation of aromatic and some heterocyclic iodides by the sequential diazotiza- tion-iodination of the aromatic amines with a KI/NaNO2/p-TsOH system in acetonitrile at room temperature. This method has general character and allows aryl iodides with either donor or acceptor sub- stituents in various positions to be obtained from the corresponding amines in
Highly Selective Room-Temperature Suzuki–Miyaura Coupling of Bromo-2-sulfonyloxypyridines for Unsymmetrical Diarylpyridines
作者:Young-Kyo Jeon、Jae-Yeon Lee、Seo-Eun Kim、Won-Suk Kim
DOI:10.1021/acs.joc.0c00793
日期:2020.6.5
A new and mild synthetic approach has been developed for the synthesis of pharmaceutically important unsymmetrical diarylpyridines via chemoselective Suzuki–Miyauracoupling reactions of bromo-2-sulfonyloxypyridines. Most reactions allow for facile access to aryl-2-sulfonyloxypyridines at room temperature in yields of 5–99% with excellent chemoselectivity in the presence of Pd(OAc)2 (2.0 mol %) and
Palladium(II) Catalyzed Suzuki/Sonogashira Cross-Coupling Reactions of Sulfonates: An Efficient Approach to C2-Functionalized Pyrimidines and Pyridines
作者:Zheng-Jun Quan、Fu-Qiang Jing、Zhang Zhang、Yu-Xia Da、Xi-Cun Wang
DOI:10.1002/ejoc.201300592
日期:2013.11
Pyrimidin-2-yl sulfonates, as a reaction partner, can be easily prepared from inexpensive commercial materials and are efficiently cross-coupled with arylboronic acids and terminal alkynes by using Pd(OAc)2-catalyzed Suzuki and Sonogashira reactions. A wide array of C2-functionalized pyrimidines have been prepared in good to excellent yields. 2-Arylpyridines and 2-(oct-1-ynyl)pyridine were also synthesized
building blocks in pharmaceutical and materials chemistry. Synthesis of 2-amino-5-(het)arylpyridine derivatives was explored via sequential chemoselective palladium-catalyzed amination and Suzuki–Miyaura cross-coupling reaction. 5-Bromo-2-tosyloxypyridine as a starting material, a new carbon–nitrogen bond was successfully formed chemoselectively on bromide over OTs group, followed by Suzuki–Miyaura couplings