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Rhodium catalyzed chelation-assisted C-H bond functionalization reactions
Denise A Colby1, Andy S Tsai, Robert G Bergman
1Division of Chemical Sciences, Lawrence Berkeley National Laboratory, and Department of Chemistry, University of California, Berkeley, California 94720, USA.
This research presents novel C-H bond functionalization methods using directing groups, offering a more efficient alternative to traditional cross-coupling reactions for synthesizing complex molecules.
Area of Science:
- Organometallic Chemistry
- Synthetic Organic Chemistry
Background:
- Metal-catalyzed cross-coupling reactions revolutionized synthesis but require prefunctionalization.
- C-H bond activation offers a more direct synthetic route, bypassing prefunctionalization steps.
- Challenges in selectivity and reactivity have been addressed through creative substrate and catalyst design.
Purpose of the Study:
- To survey the progress in C-H bond functionalization reactions that utilize a chelating directing group.
- To highlight the advantages of chelation control in terms of substrate scope and synthetic applicability.
- To showcase the application of these methods in the total synthesis of complex molecules.
Main Methods:
- Development of Rh(I) and Rh(III) catalyzed C-H functionalization reactions.
- Utilizing chelating directing groups to control selectivity and reactivity.
- Application of developed methods to intramolecular aromatic C-H annulations and coupling with various unsaturated bonds.
Main Results:
- Achieved selective and high-yielding transformations with broad applicability.
- Developed enantioselective C-H functionalization reactions.
- Successfully applied chelation-controlled C-H functionalization to the total synthesis of natural products.
Conclusions:
- Chelation-controlled C-H bond functionalization provides a powerful and versatile strategy in organic synthesis.
- These methods offer predictability and broad applicability, reducing reliance on inherent substrate stereoelectronics.
- The developed techniques are valuable tools for constructing complex molecular architectures.
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