Nickel-Catalyzed Cross-Coupling of Functionalized Difluoromethyl Bromides and Chlorides with Aryl Boronic Acids: A General Method for Difluoroalkylated Arenes
Transition‐metal‐catalyzed difluoroalkylation of aromatics remains challenging despite the importance of difluoroalkylated arenes in medicinal chemistry. Herein, the first successful example of nickel‐catalyzed difluoroalkylation of aryl boronic acids is described. The reaction allows access to a variety of functionalized difluoromethyl bromides and chlorides, and paves the way to highly cost‐efficient
Controlling the Cleavage of Carbon–Carbon Bonds To Generate α,α-Difluorobenzyl Carbanions for the Construction of Difluoromethylbenzenes
作者:Hari R. Khatri、Changho Han、Erica Luong、Xiaoliang Pan、Amna T. Adam、Maali D. Alshammari、Yihan Shao、David A. Colby
DOI:10.1021/acs.joc.9b01595
日期:2019.9.20
The initiating reagent is potassium carbonate, which represents an improvement over existing protocols that require a strong base. Fragmentation studies across substituted arenes and heteroarenes were conducted along with computational analyses to elucidate reactivity trends. Furthermore, the mildly generated α,α-difluorobenzyl carbanions from electron-deficient aromatics and heteroaromatic rings can
Fluorination of 2-oxo-ethane derivatives with diethylaminosulfur trifluoride (DAST)
作者:Gerhard Hagele、Andreas Haas
DOI:10.1016/0022-1139(95)03346-7
日期:1996.1
The fluorination of 2-oxo-ethanederivatives with DAST is described. The use of ZnI2 as a catalyst improves the yield in the fluorination of 2-phenyl-2-oxo-acetonitrile with DAST.
The ‘in situ’ generation of fluorinated aldehydes and consecutive reactions with P- and N-nucleophiles
作者:Andreas M. Haas、Gerhard Hägele
DOI:10.1016/0022-1139(96)03432-x
日期:1996.5
method for the generation of fluorinated aldehydes starting from fluorinatedcarboxylic acid esters is described. The fluorinated aldehydes generated ‘in situ’ are used to synthesize hitherto unknown fluorinated hydroxyphosphonic acid esters as well as novel fluorinated N-(phenylamino) phosphonic acid esters. The method described here may be used as a ‘one-pot synthesis’.