Conversion of esters to thioesters under mild conditions

Area of Science:

• Organic Chemistry
• Synthetic Chemistry

Background:

• Thioesters are valuable synthetic intermediates.
• Traditional methods for thioester synthesis often require harsh conditions or transition metals.

Purpose of the Study:

• To develop a novel, transition-metal-free method for ester to thioester conversion.
• To achieve selective C-O bond cleavage and C-S bond formation.

Main Methods:

• Selective C-O bond cleavage and C-S bond formation under transition-metal-free conditions.
• Utilized a broad range of substrates with excellent functional group tolerance.
• Employed selectivity and computational studies to understand reaction mechanisms.

Main Results:

• Successfully converted esters to thioesters using a practical, metal-free system.
• Demonstrated broad substrate scope and high functional group tolerance.
• Applied the method to late-stage thioesterification and gram-scale synthesis.

Conclusions:

• The developed method provides an efficient and versatile route to thioesters.
• The transition-metal-free approach offers advantages over traditional synthetic strategies.
• Mechanistic insights reveal a unique C-O cleavage/C-S formation pathway.