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Published on: April 22, 2016
HMPA-Enabled Direct γ'-Arylation of Cyclic Vinylogous Esters
Yan-Xun Li1, Wei-Ting Zhao1, Yen-Ku Wu1,2
1Department of Applied Chemistry and Center for Emergent Functional Matter Science, National Yang Ming Chiao Tung University, 1001 University Road, Hsinchu City 30010, Taiwan.
Researchers developed a palladium-catalyzed method for regioselective arylation of cyclic vinylogous esters. This approach overcomes challenges in controlling regioselectivity for conjugated carbonyl systems, enabling new synthetic pathways.
Area of Science:
- Organic Chemistry
- Catalysis
- Synthetic Methodology
Background:
- Controlling regioselectivity in the arylation of conjugated carbonyl systems is a significant synthetic challenge.
- Cyclic vinylogous esters (CVEs) are versatile building blocks in organic synthesis.
Purpose of the Study:
- To develop a regioselective palladium-catalyzed method for the arylation of CVEs.
- To address the longstanding challenge of controlling regioselectivity in deprotonative arylation reactions.
Main Methods:
- Palladium-catalyzed γ'-arylation using Pd(dba)2/cataCXium A.
- Utilizing hexamethylphosphoramide (HMPA) as a key additive for regioselectivity control.
- Employing a range of (hetero)aryl bromides and CVE substrates.
Main Results:
- Successful γ'-arylation of CVEs with diverse (hetero)aryl bromides.
- Demonstration of broad substrate scope for both CVEs and arylating agents.
- Conversion of γ'-aryl CVEs to α-arylcycloalkenones via Stork-Danheiser transposition.
Conclusions:
- A novel and effective Pd-catalyzed method for regioselective γ'-arylation of CVEs has been established.
- The developed method provides access to valuable α-arylcycloalkenones.
- This work offers a significant advancement in controlling regioselectivity for conjugated carbonyl systems.
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