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Substrate switchable Suzuki-Miyaura coupling for benzyl ester vs. benzyl halide
Masato Ohsumi1,2, Akitaka Ito2,3, Nagatoshi Nishiwaki2,3
1Kochi National College of Technology Nankoku Kochi 783-8508 Japan.
This study introduces a switchable Suzuki-Miyaura coupling method for synthesizing diarylmethanes. It efficiently couples benzyl esters or halides with arylboronic acids by adjusting reaction conditions.
Area of Science:
- Organic Chemistry
- Catalysis
- Synthetic Methodology
Background:
- Suzuki-Miyaura coupling is a vital carbon-carbon bond-forming reaction.
- Developing selective and efficient coupling methods for diverse substrates remains a challenge.
Purpose of the Study:
- To develop a substrate-switchable Suzuki-Miyaura coupling protocol.
- To enable selective synthesis of diarylmethanes from either benzyl esters or benzyl halides.
Main Methods:
- Developed two distinct reaction conditions for Suzuki-Miyaura coupling.
- Condition 1: Optimized for benzyl esters (carbonates, acetates).
- Condition 2: Optimized for benzyl halides (bromides, chlorides), highlighting the role of water.
Main Results:
- Benzyl esters selectively coupled with arylboronic acids under ester conditions.
- Benzyl halides selectively coupled with arylboronic acids under halide conditions.
- The developed system demonstrated substrate selectivity and was validated in competitive intermolecular/intramolecular reactions.
Conclusions:
- A novel, substrate-switchable Suzuki-Miyaura coupling system was successfully established.
- The protocol allows for the targeted synthesis of diarylmethanes by selecting appropriate reaction conditions.
- This method offers enhanced control and versatility in organic synthesis.
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