Copper-Mediated -CF(OCF₃)(CF₂H) Transfer to Organic Electrophiles

Area of Science:

• Medicinal Chemistry
• Organometallic Chemistry
• Fluorine Chemistry

Background:

• Fluorine incorporation enhances drug properties like lipophilicity and hydrogen bonding.
• Specific fluoroalkyl groups, -CF2H and -OCF3, are of significant interest in medicinal chemistry.
• Developing efficient methods for introducing these groups is crucial for drug discovery.

Purpose of the Study:

• To synthesize novel copper complexes capable of transferring fluoroalkyl groups.
• To develop a streamlined method for introducing geminal -OCF3 and -CF2H moieties into organic molecules.
• To investigate the role of coligands and additives in facilitating these fluoroalkylation reactions.

Main Methods:

• Synthesis of stable Cu[CF(OCF3)(CF2H)]L complexes via insertion of perfluoro(methyl vinyl ether) into Cu-H bonds.
• Utilizing Stryker's reagent ([CuH(PPh3)]6) and ancillary ligands (L).
• Reaction optimization including computational analysis and the use of dimethylsulfoxide as a pivotal coligand.
• Employing CuBr as an additive for specific transformations.

Main Results:

• Successful preparation of stable copper complexes containing the CF(OCF3)(CF2H) moiety.
• Demonstrated effective transfer of the fluoroalkyl group to aroyl chlorides and aryl iodides.
• Identified dimethylsulfoxide as a key coligand for efficient fluoroalkylation.
• Developed a method for introducing geminal -OCF3 and -CF2H groups in a single step.

Conclusions:

• The developed copper complexes and methodologies enable the efficient introduction of valuable fluoroalkyl groups into medicinally relevant scaffolds.
• This work provides a new synthetic route for incorporating geminal -OCF3 and -CF2H functionalities, potentially improving drug efficacy and pharmacokinetic profiles.
• The study highlights the importance of coligand selection and reaction conditions in organofluorine chemistry.