Related Experiment Video
Updated: Dec 4, 2025

Protocol for the Synthesis of Ortho-trifluoromethoxylated Aniline Derivatives
Published on: January 19, 2016
Deprotonative Functionalization of the Difluoromethyl Group
Laura Santos1, Armen Panossian1, Morgan Donnard1
1Université de Strasbourg, Université de Haute-Alsace, CNRS, UMR 7042-LIMA, ECPM, 25 Rue Becquerel, Strasbourg 67087, France.
Researchers developed a new method to functionalize 3-(difluoromethyl)pyridine using deprotonation and trapping. This approach yields novel silylated compounds, enabling access to diverse 3-(difluoroalkyl)pyridines.
Area of Science:
- Organic Chemistry
- Synthetic Chemistry
- Heterocyclic Chemistry
Background:
- 3-(difluoromethyl)pyridine is a valuable building block in medicinal chemistry.
- Direct functionalization of the difluoromethyl group can be challenging.
Purpose of the Study:
- To develop a novel synthetic route for the functionalization of 3-(difluoromethyl)pyridine.
- To create a library of diverse 3-(difluoroalkyl)pyridine derivatives.
Main Methods:
- Direct deprotonation of the -CHF2 group using a lithiated base in Tetrahydrofuran (THF).
- Trapping the resulting anion with various electrophiles.
- In situ quenching to form a silylated intermediate (3-pyridyl-CF2-SiMe2Ph).
- Postfunctionalization of the silylated compound using a fluoride source.
Main Results:
- Successful direct deprotonation and electrophilic trapping of 3-(difluoromethyl)pyridine.
- Synthesis of a novel silylated intermediate, 3-pyridyl-CF2-SiMe2Ph.
- Generation of a broader library of 3-(difluoroalkyl)pyridines through postfunctionalization, including compounds not accessible by direct methods.
Conclusions:
- The developed method provides efficient access to functionalized 3-(difluoromethyl)pyridine derivatives.
- The strategy overcomes limitations of direct deprotonation, enabling synthesis of previously inaccessible compounds.
- This work expands the synthetic utility of difluoromethylpyridines for various applications.
More Related Videos
10:10Application of Elemental Lanthanides in the Selective C-F Activation of Trifluoromethylated Benzofulvenes Providing Access to Various Difluoroalkenes
Published on: July 28, 2018
09:45Modification and Functionalization of the Guanidine Group by Tailor-made Precursors
Published on: April 27, 2017
Related Concept Videos
Electrophilic Aromatic Substitution: Fluorination and Iodination of Benzene
Diazonium Group Substitution: –OH and –H
ortho–para-Directing Deactivators: Halogens
ortho–para-Directing Activators: –CH3, –OH, –⁠NH2, –OCH3
Diazonium Group Substitution with Halogens and Cyanide: Sandmeyer and Schiemann Reactions
meta-Directing Deactivators: –NO2, –CN, –CHO, –⁠CO2R, –COR, –CO2H