A scalable and operationally simple radical trifluoromethylation

Area of Science:

• Organic Chemistry
• Synthetic Chemistry
• Catalysis

Background:

• The trifluoromethyl (CF3) group is vital in pharmaceuticals and materials science.
• Existing trifluoromethylation reagents are often expensive or require complex synthesis, limiting large-scale applications.
• Trifluoroacetic anhydride is a cost-effective CF3 source but typically requires harsh conditions.

Purpose of the Study:

• To develop a scalable and operationally simple trifluoromethylation method.
• To utilize readily available and inexpensive starting materials.
• To overcome the limitations of previous trifluoromethylation strategies.

Main Methods:

• Employing trifluoroacetic anhydride as the CF3 source.
• Utilizing pyridine N-oxide as a substrate.
• Leveraging photoredox catalysis for facile decarboxylation.
• Generating the trifluoromethyl radical under mild conditions.

Main Results:

• A novel strategy for scalable trifluoromethylation was successfully demonstrated.
• The reaction proceeds under operationally simple and mild conditions.
• Facile decarboxylation of trifluoroacetate to the CF3 radical was achieved via photoredox catalysis.

Conclusions:

• This method provides an attractive solution for large-scale trifluoromethylation.
• The use of trifluoroacetic anhydride with photoredox catalysis offers a cost-effective and efficient approach.
• This work expands the synthetic utility of readily available fluorinated building blocks.