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Efficient Stille cross-coupling reaction using aryl chlorides or bromides in water
Christian Wolf1, Rachel Lerebours
1Department of Chemistry, Georgetown University, Washington, D.C. 20057, USA. cw27@georgetown.edu
The Journal of Organic Chemistry
|September 13, 2003
Summary
A novel Stille cross-coupling reaction in water efficiently synthesizes biaryls using aryl halides. This palladium-catalyzed method avoids organic solvents and tolerates various functional groups, simplifying product isolation and enabling catalyst recycling.
Area of Science:
- Organic Chemistry
- Catalysis
- Green Chemistry
Background:
- Stille cross-coupling is a vital reaction for C-C bond formation.
- Traditional Stille couplings often require harsh conditions and organic solvents.
- Developing greener synthetic methodologies is crucial for sustainable chemistry.
Purpose of the Study:
- To develop an efficient and environmentally friendly Stille cross-coupling reaction.
- To utilize water as a solvent for the Stille coupling reaction.
- To explore the use of a novel palladium-phosphinous acid catalyst.
Main Methods:
- The study employed a palladium-phosphinous acid catalyst, [(t-Bu)(2)P(OH)](2)PdCl(2).
- A variety of aryl halides (chlorides and bromides) were used as substrates.
- The reaction was conducted in neat water without the need for organic cosolvents.
Main Results:
- The Stille cross-coupling reaction proceeded efficiently in neat water, yielding biaryls in good to high yields.
- The catalytic system tolerated various functional groups, including ketones and nitriles.
- The palladium complexes exhibited air stability and good solubility in water, facilitating reaction operation and product isolation.
- Catalyst recycling was successfully demonstrated, highlighting the economic and environmental benefits.
Conclusions:
- An efficient Stille cross-coupling reaction in water has been successfully developed.
- This method offers a greener alternative to traditional cross-coupling reactions by eliminating organic cosolvents.
- The developed catalytic system demonstrates potential for practical applications due to its efficiency, functional group tolerance, and recyclability.