A new transition-metal-free amination of pyridine-2-sulfonyl chloride and related N-heterocycles using magnesium amides of type R2NMgCl·LiCl is reported. Additionally, the directed ortho-magnesiation of pyridine-2-sulfonamides using TMPMgCl·LiCl was investigated. Reaction of the magnesium intermediates with various electrophiles and subsequent amination using magnesium amides led to a range of 2,3-functionalized
Nickel-Catalyzed Amination of Aryl Chlorides and Sulfamates in 2-Methyl-THF
作者:Noah F. Fine Nathel、Junyong Kim、Liana Hie、Xingyu Jiang、Neil K. Garg
DOI:10.1021/cs501045v
日期:2014.9.5
The nickel-catalyzedamination of aryl O-sulfamates and chlorides using the green solvent 2-methyl-THF is reported. This methodology employs the commercially available and air-stable precatalyst NiCl2(DME), is broad in scope, and provides access to aryl amines in synthetically useful yields. The utility of this methodology is underscored by examples of gram-scale couplings conducted with catalyst loadings
The amination of 2‐pyridine‐ and 8‐quinolinesulfonic acids using magnesium amides is reported. Various amides reacted with N‐heterocyclic sulfonic acids, leading to aminopyridines and aminoquinolines in up to 98 % yield. Various amines important in medicinal chemistry, such as the antidepressant amoxapine, were suitable for these aminations.
Application of a 2-aryl indenylphosphine ligand in the Buchwald–Hartwig cross-coupling reactions of aryl and heteroaryl chlorides under the solvent-free and aqueous conditions
An efficient solvent-free protocol for the Buchwald–Hartwig cross-coupling reaction of aryl and heteroaryl chlorides with primary and secondary amines using the Pd(dba)2/ligand 1 catalytic system has been developed. Notably, the catalytic system also efficiently catalyzed the reaction under aqueous conditions.
Ni(0)/NHC-based catalyst system can promote the amination of N-heteroaryl methyl ethers via the cleavage of normally unreactive carbon oxygen bonds. Electron-deficient N-heteroarenes including pyridine, quinoline, isoquinoline, and quinoxaline undergo amination to afford aminopyridine and related heteroarenes, which constitute an important class of compounds. (C)2012 Elsevier Ltd. All rights reserved.