A Modular Approach to N-Fluoroalkyl Amides via Nitrene Insertion Into Fluoroalkylcopper(I).

Area of Science:

• Organic Synthesis
• Organometallic Chemistry
• Fluorine Chemistry

Background:

• Fluoroalkyl amides are important motifs in pharmaceuticals and materials science.
• Efficient methods for synthesizing N-fluoroalkyl compounds remain a challenge.

Purpose of the Study:

• To develop a novel copper-mediated three-component synthesis of N-fluoroalkyl amides.
• To establish a modular approach for constructing acyclic N-fluoroalkyl structures.

Main Methods:

• Utilized fluoroalkylcopper species ([CuI-CF3], [CuI-CF2CO2Et], [CuI-C2F5]) as nucleophilic sources of fluoroalkyl groups.
• Employed a dioxazolone as a nitrene precursor.
• Incorporated electrophiles to achieve three-component coupling.
• Characterized key intermediates using single-crystal X-ray diffraction.

Main Results:

• Achieved the first copper-mediated three-component synthesis of N-fluoroalkyl amides.
• Demonstrated the unprecedented construction of acyclic N-C2F5 and N-CF2CO2Et structures.
• Showcased broad substrate scope and functional group tolerance.
• Confirmed the pivotal step involves nitrene migratory insertion into the Cu-Rf bond.
• Synthesized a diverse library of N-fluoroalkyl-N-alkyl(aryl)amides.

Conclusions:

• The developed method provides a versatile and efficient route to N-fluoroalkyl amides.
• The copper-mediated nitrene insertion strategy is key to forming the N-fluoroalkyl bond.
• The approach has potential applications in drug discovery and materials science through derivatization of bioactive molecules.