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Efficient Stille cross-coupling reaction catalyzed by the Pd(OAc)2/Dabco catalytic system
Jin-Heng Li1, Yun Liang, De-Ping Wang
1Key Laboratory of Chemical Biology & Traditional Chinese Medicine Research, College of Chemistry and Chemical Engineering, Hunan Normal University, Changsha 410081, China. jhli@hunnu.edu.cn
The Journal of Organic Chemistry
|March 25, 2005
Summary
A new Stille cross-coupling reaction using palladium acetate and triethylenediamine offers an efficient method for synthesizing biaryls, alkenes, and alkynes. This catalytic system achieves high yields and exceptional turnover numbers, demonstrating its effectiveness in organic synthesis.
Area of Science:
- Organic Chemistry
- Catalysis
- Synthetic Methodology
Background:
- The Stille cross-coupling reaction is a vital tool for carbon-carbon bond formation.
- Developing more efficient and robust catalytic systems for Stille coupling remains an active area of research.
- Palladium-catalyzed reactions are widely used in organic synthesis due to their versatility.
Purpose of the Study:
- To develop an efficient palladium-catalyzed Stille cross-coupling reaction procedure.
- To investigate the use of palladium acetate (Pd(OAc)2) and triethylenediamine (Dabco) as a catalytic system.
- To synthesize biaryls, alkenes, and alkynes from various aryl halides and organotin compounds.
Main Methods:
- Utilizing a catalytic system comprising palladium acetate (Pd(OAc)2) and triethylenediamine (Dabco).
- Coupling various aryl halides (iodides, bromides, activated chlorides) with organotin compounds.
- Employing reaction conditions optimized for high yield and efficiency.
Main Results:
- Achieved efficient Stille cross-coupling of diverse aryl halides with organotin reagents.
- Obtained good to excellent yields of desired biaryls, alkenes, and alkynes.
- Observed exceptionally high turnover numbers (TONs), reaching up to 980,000 for specific substrates.
Conclusions:
- The developed Pd(OAc)2/Dabco system provides an efficient and effective method for Stille cross-coupling reactions.
- The catalytic system demonstrates broad substrate scope and high catalytic efficiency, evidenced by high TONs.
- This methodology offers a valuable advancement for the synthesis of complex organic molecules.