Thiol-free arene C-H thioesterification enabled by a photoactive electron donor-acceptor complex

Area of Science:

• Organic Chemistry
• Synthetic Chemistry
• Catalysis

Background:

• Thioester synthesis is crucial in organic chemistry.
• Existing methods often require catalysts or thiols, limiting their application.
• Late-stage functionalization of complex molecules remains a challenge.

Purpose of the Study:

• To develop a novel, efficient, and versatile method for thioester synthesis.
• To enable catalyst- and thiol-free thioester formation.
• To facilitate late-stage modification of bioactive compounds.

Main Methods:

• Utilized an interrupted Pummerer reaction for arene activation.
• Employed an electron donor-acceptor (EDA) complex strategy.
• Performed the synthesis in a one-pot procedure under natural sunlight.

Main Results:

• Successfully synthesized thioesters from arenes, carboxylic acids, and tetramethylthiourea.
• Demonstrated a catalyst- and thiol-free reaction pathway.
• Showcased the method's effectiveness in late-stage functionalization of complex molecules.
• Confirmed operation under natural sunlight conditions.

Conclusions:

• The developed method offers a valuable new route for thioester synthesis.
• The catalyst- and thiol-free approach simplifies the process and broadens its applicability.
• The method's compatibility with late-stage modification and sunlight operation highlights its synthetic utility.