Coumarin-Rewired Benzothiophenes: Skeletal Editing for Peripheral Heterofunctionalization

Area of Science:

• Organic Chemistry
• Synthetic Chemistry

Background:

• Benzothiophene derivatives are crucial in medicinal chemistry and materials science.
• Conventional C-H functionalization methods often face selectivity challenges.
• Developing efficient strategies for benzothiophene modification is essential.

Purpose of the Study:

• To report a novel single-atom skeletal editing strategy for benzothiophenes.
• To achieve dual-site heterofunctionalization of the benzothiophene core.
• To enable selective peripheral modification using a coumarin-derived module.

Main Methods:

• Utilizing a single-atom catalytic approach.
• Employing a sulfonium intermediate formed with coumarin.
• Sequential ring opening and fusion reactions to reconstruct the scaffold.
• Tuning reaction conditions for selective benzoyl or carboxyl donation.

Main Results:

• Successful dual-site heterofunctionalization of benzothiophenes.
• Demonstrated selective peripheral modification via coumarin module.
• Efficient framework remodeling and diversification achieved.
• Overcame selectivity issues associated with traditional C-H functionalization.

Conclusions:

• The reported single-atom skeletal editing strategy offers an efficient route for benzothiophene functionalization.
• This method provides a versatile platform for generating diverse benzothiophene derivatives.
• The approach overcomes limitations of conventional methods, enabling precise molecular construction.