Halogen-Exchange Fluorination of Aromatic Halides with HF or HF-Base
作者:Tsuyoshi Fukuhara、Norihiko Yoneda
DOI:10.1246/cl.1993.509
日期:1993.3
Heteroaromatic halides such as 2-chloropyrimidines and 2-chloropyridines, and 2,4-dinitrochlorobenzene underwent halogen-exchange fluorination with the treatment of HF or HF-base solutions to affor...
The proton sponge–triethylamine tris(hydrogen fluoride) mixture provides a mild and efficient fluorinatingreagent for the selective introduction of a fluorine atom, by halogen exchange, into dichlorodiazines.
Selective fluorination by halogen exchange of chlorodiazines and chloropyridines promoted by the ‘proton sponge’—triethylamine tris(hydrogen fluoride) system
The ‘proton sponge’—triethylamine tris(hydrogen fluoride) mixtures provide a mild and efficient fluorinating reagent to introduce selectively fluorine atoms by halogenexchange into chlorodiazines and chloronitropyridine series.
and a cheap chloride source, C(sp2)‒NH2 can be converted into C(sp2)‒Cl bonds. The method is characterized by its wide functional group tolerance and substrate scope, allowing the modification of >20 different classes of heteroaromatic motifs (five- and six-membered heterocycles), bearing numerous sensitive motifs. The facile conversion of NH2 into Cl in a late-stage fashion enables practitioners to
A Unified Approach to Decarboxylative Halogenation of (Hetero)aryl Carboxylic Acids
作者:Tiffany Q. Chen、P. Scott Pedersen、Nathan W. Dow、Remi Fayad、Cory E. Hauke、Michael C. Rosko、Evgeny O. Danilov、David C. Blakemore、Anne-Marie Dechert-Schmitt、Thomas Knauber、Felix N. Castellano、David W. C. MacMillan
DOI:10.1021/jacs.2c02392
日期:2022.5.11
fundamental motif in synthetic chemistry, playing a critical role in metal-mediated cross-coupling reactions and serving as important scaffolds in drug discovery. Although thermal decarboxylative functionalization of aryl carboxylic acids has been extensively explored, the scope of existing halodecarboxylation methods remains limited, and there currently exists no unified strategy that provides access to