Visible-Light-Induced Carbonylative Synthesis of Aliphatic Thioesters.

Area of Science:

• Organic Chemistry
• Catalysis
• Synthetic Methodology

Background:

• Thioesters are crucial functional groups in organic synthesis.
• Existing methods for thioester synthesis often require harsh conditions or expensive catalysts.
• Development of efficient and mild synthetic routes is highly desirable.

Purpose of the Study:

• To develop a novel visible-light-induced, metal-free catalytic carbonylation method for alkyl thioester synthesis.
• To utilize readily available Hantzsch esters as alkyl radical precursors.
• To achieve high yields and functional group tolerance in the synthesis of diverse alkyl thioesters.

Main Methods:

• Visible-light photoredox catalysis.
• Metal-free reaction conditions.
• Utilizing Hantzsch esters as alkyl radical precursors and thiosulfonates as sulfur and oxidant sources.
• Carbonylation in the presence of carbon monoxide.

Main Results:

• Efficient synthesis of alkyl thioesters under mild conditions.
• High yields and excellent functional group tolerance observed.
• Demonstrated the dual role of thiosulfonates as sulfur source and endogenous oxidant.
• Successful generation of acyl radical intermediates for thioester formation.

Conclusions:

• The developed method offers a sustainable and efficient approach for alkyl thioester synthesis.
• The metal-free, visible-light-driven strategy broadens the scope of thioester preparation.
• This methodology provides a valuable tool for organic chemists seeking mild and effective synthetic routes.