[DE] 2-(PYRIDIN-2-YL)-PYRIMIDINE UND IHRE VERWENDUNG ZUR BEKÄMPFUNG VON SCHADPILZEN [EN] 2-(PYRIDIN-2-YL)-PYRIMIDINES AND THEIR USE FOR CONTROLLING PATHOGENIC FUNGI [FR] 2-(PYRIDIN-2-YL)-PYRIMIDINES ET LEUR UTILISATION DANS LA LUTTE CONTRE DES CHAMPIGNONS PARASITES
A novel iron-mediated direct C–H arylation of quinones and pyridine analogues with arylboronic acids has been developed using dichloromethane and water as solvents at ambient temperature. FeS is employed and serves as an efficient catalyst. A detailed reaction mechanism is speculated and expounded.
Mild Fluorination of Chloropyridines with in Situ Generated Anhydrous Tetrabutylammonium Fluoride
作者:Laura J. Allen、Joseck M. Muhuhi、Douglas C. Bland、Rachel Merzel、Melanie S. Sanford
DOI:10.1021/jo5003054
日期:2014.6.20
This paper describes the fluorination of nitrogen heterocycles usinganhydrous NBu4F. Quinoline derivatives as well as a number of 3- and 5-substituted pyridines undergo high-yielding fluorination at room temperature using this reagent. These results with anhydrous NBu4F compare favorably to traditional halex fluorinationsusing alkali metal fluorides, which generally require temperatures of ≥100 °C
Synthesis of (Poly)halo-Substituted Diarylsulfones through Palladium-Catalyzed C-H Bond Sulfonylation Using (Poly)Halobenzenesulfonyl Chlorides
作者:Arpan Sasmal、Jitendra K. Bera、Henri Doucet、Jean-François Soulé
DOI:10.1002/ejoc.201800819
日期:2018.12.2
A one‐step procedure for the synthesis of (poly)halo‐substituted diarylsulfones was developed. The reaction involves ortho C–H bond sulfonylation of 2‐arylpyridines with (poly)halo‐substituted benzenesulfonyl chlorides. These reaction conditions tolerated C–F, C–Cl, C–Br and even C–I bonds.
Hiyama Cross-Coupling of Chloro-, Fluoro-, and Methoxypyridyltrimethylsilanes: Room-Temperature Novel Access to Functional Bi(het)aryl
作者:Philippe Pierrat、Philippe Gros、Yves Fort
DOI:10.1021/ol047482u
日期:2005.2.1
pyridyltrimethylsilanes allowed us to perform efficient Hiyama cross-coupling with various (het)arylhalides. The reactions proceeded smoothly at room temperature leading to the corresponding functional bis(het)aryl in fair to excellent yields. The presence of pyridine nitrogen alpha to the trimethylsilyl group was requisite to achieve the cross-coupling. [Reaction: see text]
Biphenyl-Based Diaminophosphine Oxides as Air-Stable Preligands for the Nickel-Catalyzed Kumada-Tamao-Corriu Coupling of Deactivated Aryl Chlorides, Fluorides, and Tosylates
couple: Cooperative bimetallic activation of CF and CO bonds gave rise to easy coupling with arylfluorides and tosylates. Novel air‐ and moisture‐stable diaminophosphine oxides derived from 1,1′‐biphenyl‐2,2′‐diamine proved to be versatile preligands for the nickel‐catalyzed cross‐coupling of aryl Grignard reagents with a variety of deactivated aryl chlorides, fluorides, and tosylates (see scheme)