Asymmetric Fluorolactonization with a Bifunctional Hydroxyl Carboxylate Catalyst

Area of Science:

• Organic Chemistry
• Asymmetric Synthesis
• Organocatalysis

Background:

• Enantioselective fluorolactonization is crucial for synthesizing chiral fluorinated compounds.
• Development of efficient and selective catalytic systems remains a challenge.

Purpose of the Study:

• To report the first highly enantioselective fluorolactonization using an electrophilic fluorinating reagent and a novel organocatalyst.
• To explore the mechanism and potential applications of this new catalytic system.

Main Methods:

• Utilized Selectfluor as the electrophilic fluorinating reagent.
• Employed a novel bifunctional organocatalyst featuring a carboxylate anion and a benzyl alcohol unit.
• Conducted mechanistic studies to elucidate the reaction pathway.

Main Results:

• Achieved highly enantioselective fluorolactonization, yielding fluorinated isobenzofuranones.
• Obtained products in good yields with up to 94% enantiomeric excess (ee) and 97:3 enantiomeric ratio (er).

Conclusions:

• Demonstrated the first successful highly enantioselective fluorolactonization with Selectfluor and a novel bifunctional organocatalyst.
• Proposed a unique reaction mechanism with potential for broader applications in organic synthesis.