Cationic cyclopentannelation of allene ethers
1Department of Chemistry, 2545 The Mall, University of Hawaii, Honolulu, Hawaii 96822, USA. tius@gold.chem.hawaii.edu
The Nazarov cyclization using allenyl ethers efficiently creates functionalized cyclopentenones. An enantioselective method was developed using an alpha,beta-unsaturated morpholino amide for cyclopentane synthesis.
Area of Science:
- Organic Chemistry
- Synthetic Chemistry
Background:
- The Nazarov cyclization is a key reaction for forming cyclopentenones.
- Allenyl ethers offer a versatile substrate for cyclization reactions.
Purpose of the Study:
- To explore variants of the Nazarov cyclization using allenyl ethers.
- To develop an enantioselective synthesis of functionalized cyclopentenones.
Main Methods:
- Utilizing three variants of the Nazarov cyclization based on different electrophiles.
- Employing an alpha,beta-unsaturated morpholino amide in the cyclization precursor synthesis.
- Developing an enantioselective cyclopentannelation.
Main Results:
- Demonstrated the preparation of diverse, highly functionalized cyclopentenones.
- Successfully implemented an enantioselective Nazarov cyclization.
- Showcased the utility of allenyl ethers in cyclopentenone synthesis.
Conclusions:
- Allenyl ether-based Nazarov cyclization is a powerful tool for synthesizing complex cyclopentenones.
- The developed enantioselective variant expands the synthetic utility for chiral cyclopentenone targets.
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