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Titanium(IV)-promoted Mukaiyama aldol-Prins cyclizations
Brian Patterson1, Shinji Marumoto, Scott D Rychnovsky
1Department of Chemistry, 516 Rowland Hall, University of California, Irvine, California 92697-2025, USA.
Organic Letters
|August 15, 2003
Summary
A novel Mukaiyama aldol-Prins cyclization efficiently synthesizes bromotetrahydropyran products from enol ethers and aldehydes. This powerful cascade reaction creates multiple new bonds and stereocenters, advancing synthetic chemistry.
Area of Science:
- Organic Chemistry
- Synthetic Chemistry
- Catalysis
Background:
- The Mukaiyama aldol-Prins (MAP) reaction is a valuable tool for constructing complex molecules.
- Developing new cascade reactions is crucial for efficient synthesis.
- Tetrahydropyran motifs are prevalent in natural products and pharmaceuticals.
Purpose of the Study:
- To develop a new, efficient version of the Mukaiyama aldol-Prins cyclization.
- To explore the coupling of unsaturated enol ethers with aldehydes.
- To establish a novel cascade reaction for synthesizing substituted tetrahydropyrans.
Main Methods:
- Utilized unsaturated enol ethers and aldehydes as substrates.
- Employed titanium tetrabromide (TiBr(4)) as a catalyst.
- Investigated a cascade reaction sequence involving cyclization.
Main Results:
- Successfully developed a new Mukaiyama aldol-Prins cyclization.
- Demonstrated the coupling of enol ethers with aldehydes to yield products.
- Obtained 4-bromotetrahydropyran derivatives.
- Achieved the formation of two new carbon-carbon bonds.
- Generated a new ring system.
- Created three new stereogenic centers in a single cascade reaction.
Conclusions:
- The developed MAP cyclization is a powerful new synthetic tool.
- This reaction offers an efficient route to complex tetrahydropyran structures.
- The methodology is expected to find broad applications in organic synthesis.