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Synthesis and Characterization of Functionalized Metal-organic Frameworks
Published on: September 5, 2014
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Multicomponent Synthesis of Isoindolinone Frameworks via RhIII -Catalysed in situ Directing Group-Assisted Tandem
Liang Wang1, Xi Liu1, Jian-Biao Liu2
1School of Petrochemical Engineering, Jiangsu Key Laboratory of Advanced Catalytic Materials & Technology, Changzhou University, Changzhou, 213164, P. R. China.
Chemistry, an Asian Journal
|February 3, 2018
Summary
A new Rhodium(III)-catalyzed reaction efficiently synthesizes isoindolinone structures from simple precursors. This method uses a directing group strategy for C-H olefination and aza-Michael addition, offering a versatile route to complex molecules.
Area of Science:
- Organic Chemistry
- Catalysis
- Synthetic Methodology
Background:
- Isoindolinone frameworks are prevalent in pharmaceuticals and natural products.
- Efficient synthetic routes to substituted isoindolinones are highly sought after.
- Rhodium(III)-catalyzed C-H functionalization offers a powerful tool for C-C and C-N bond formation.
Purpose of the Study:
- To develop a novel Rh(III)-catalyzed three-component reaction for isoindolinone synthesis.
- To explore the utility of in situ generated directing groups for tandem reactions.
- To investigate the mechanism and scope of the developed synthetic protocol.
Main Methods:
- Three-component reaction involving benzoyl chlorides, o-aminophenols, and activated alkenes.
- Rhodium(III) catalysis with in situ generated bidentate directing group (DG).
- Tandem ortho C-H olefination followed by aza-Michael addition and cyclization.
- Computational studies to elucidate reaction mechanism and selectivity.
Main Results:
- Successful synthesis of diverse isoindolinone frameworks.
- Demonstrated good chemoselectivity and broad functional group tolerance.
- Identified the crucial role of the hydroxyl group on the N-aryl ring in enhancing chemoselectivity via computational analysis.
- Established a direct assembly pathway from readily available starting materials.
Conclusions:
- A novel and efficient Rh(III)-catalyzed three-component synthesis of isoindolinones has been established.
- The developed protocol offers a versatile and practical approach for constructing complex isoindolinone scaffolds.
- Understanding the role of directing groups and substrate features is key to optimizing catalytic reactions.
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