A Modular Three-Component Approach for Site-selective Tandem Arene Thiophosphorylation

Area of Science:

• Organic Synthesis
• Organophosphorus Chemistry
• Green Chemistry

Background:

• Thiophosphates are crucial reagents in organic and inorganic synthesis, particularly in agricultural chemistry.
• Existing methods for synthesizing phosphorothioates often involve harsh conditions or lack site-selectivity.
• There is a need for efficient, metal-free, and environmentally benign synthetic strategies.

Purpose of the Study:

• To develop a modular, three-component strategy for site-selective arene C-H thiophosphorylation.
• To demonstrate a metal-free and green synthetic route to S-aryl phosphorothioates.
• To showcase the practicality and broad applicability of the developed method.

Main Methods:

• A three-component reaction involving a thianthrenium salt, 1,4-diazabicyclo[2.2.2]octane-sulfur dioxide (DABSO), and diarylphosphine oxides.
• Site-selective C-H functionalization of arenes.
• Late-stage modification of synthesized phosphorothioates.

Main Results:

• Successful synthesis of a diverse range of S-aryl phosphorothioates.
• Demonstration of site-selective thiophosphorylation via C-H activation.
• The method is metal-free, proceeds under mild conditions, and offers broad substrate scope.

Conclusions:

• The developed three-component strategy provides an efficient and green pathway for synthesizing phosphorothioates.
• This C-H functionalization approach offers a practical and versatile tool for organic and medicinal chemistry.
• The method's applicability in late-stage modification highlights its potential for drug discovery and development.