Studies in azide chemistry. Part V. Synthesis of 4-azido-2,3,5,6-tetrafluoro-, 4-azido-3-chloro-2,5,6-trifluoro-, and 4-azido-3,5-dichloro-2,6-difluoro-pyridine, and some thermal reactions of the tetrafluoro-compound
作者:R. E. Banks、G. R. Sparkes
DOI:10.1039/p19720002964
日期:——
6-tetrafluoropyridine and 4-amino-2,3,5,6-tetrafluoropyridine. Thermal decomposition of the azide in a mixture of cyclo-hexane, -heptane, and -octane reveals that C–H ‘insertion’ is encouraged by increase in ring size, and thermolysis experiments with cis- and trans-1,2-dimethylcyclohexane show that this type of reaction lacks stereospecificity. The results of reactions between the azide and trans-4-methylpent-2-ene
Carboxylic Acid Deoxyfluorination and One-Pot Amide Bond Formation Using Pentafluoropyridine (PFP)
作者:William D. G. Brittain、Steven L. Cobb
DOI:10.1021/acs.orglett.1c01953
日期:2021.8.6
cheap commercially available reagent, in the deoxyfluorination of carboxylicacids to acyl fluorides. The acyl fluorides can be formed from a range of acids under mild conditions. We also demonstrate that PFP can be utilized in a one-pot amide bond formation via in situ generation of acyl fluorides. This one-pot deoxyfluorination amide bond-forming reaction gives ready access to amides in yields of ≤94%
Hydrogen Bond Directed Photocatalytic Hydrodefluorination and Methods of Use Thereof
申请人:The Board of Regents for Oklahoma State University
公开号:US20200399196A1
公开(公告)日:2020-12-24
Methods of synthesizing compounds comprising fluorinated aryl groups are disclosed, wherein said methods utilize hydrogen bond directed photocatalytic hydrodefluorination.
作者:Richard D. Chambers、Peter A. Martin、Graham Sandford、D. Lyn H. Williams
DOI:10.1016/j.jfluchem.2008.04.009
日期:2008.10
The effect of fluorine as a substituent group on nucleophilic aromatic substitution is discussed, where a fluorine atom located ortho to the point of substitution may be of variable activating influence, whereas fluorine located para is slightly deactivating and meta is activating. A rationale of these effects is presented and evidence to support polar influences by ortho fluorine is advanced. The
Synthesis of substituted imidazopyridines from perfluorinated pyridine derivatives
作者:Alireza Poorfreidoni、Reza Ranjbar-Karimi
DOI:10.1016/j.tetlet.2016.11.045
日期:2016.12
4-Phenylsulfonyl tetrafluoropyridine was reacted with various N-aryl amidines to give the corresponding imidazopyridine systems via an intramolecular nucleophilic aromatic substitution process whilst pentafluoropyridine gave N′-(perfluoropyridin-4-yl)-N-phenylbenzimidamide and 2,3,5,6-tetrafluoro-N-phenylpyridin-4-amine by a competing elimination reaction.