functionalized 2-arylpyridines are obtained in moderate to excellent yields by a one-step chemical procedure from corresponding halides. The NiBr2(2,2′-bipyridine) complex appears to be an extremely suitable catalyst for the activation in the presence of manganese dust of aromatic halides and pyridyl halides functionalized by reactive groups. The versatility of this original process represents a simple alternative
2-Arylpyridines substituted on aryl and/or on pyridine nuclei can be obtained in good to high yields in one step by electroreduction of mixtures of the corresponding aryl and pyridyl halides using the sacrificial iron anode process and a nickel 2,2'-bipyridine complex catalyst in DMF as solvent. (C) 2000 Elsevier Science Ltd. All rights reserved.
Preparation of Polyfunctional Organozinc Halides by an InX<sub>3</sub>- and LiCl-Catalyzed Zinc Insertion to Aryl and Heteroaryl Iodides and Bromides
作者:Andreas D. Benischke、Grégoire Le Corre、Paul Knochel
DOI:10.1002/chem.201605139
日期:2017.1.18
of zinc powder to various aryliodides in THF at 50 °C in up to 95 % yield. The use of a THF/DMPU (1:1) mixture shortens the reaction rates and allows the preparation of keto‐substituted arylzinc reagents. In the presence of In(acac)3 (3 mol %) and LiCl (150 mol %), the zinc insertion to various aryl and heteroaryl bromides proceeds smoothly (50 °C, 2–18 h). Alkyl bromides are also converted to the