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Stereoselective radical aryl migration from silicon to carbon
S Amrein1, M Bossart, T Vasella
1Laboratorium für Organische Chemie, Eidgenössische Technische Hochschule, ETH Zentrum, Zürich, Switzerland.
The Journal of Organic Chemistry
|July 13, 2000
Summary
This study introduces a novel radical phenyl migration reaction from silicon to carbon, creating valuable 3-phenylated alcohols with high selectivity. The research also details stereoselective 1,4 aryl migration and a new alpha-arylation method for esters.
Area of Science:
- Organic Chemistry
- Synthetic Chemistry
- Stereoselective Synthesis
Background:
- Radical reactions are crucial in organic synthesis.
- Silicon-mediated transformations offer unique synthetic pathways.
- Diastereoselective synthesis is key for complex molecule construction.
Purpose of the Study:
- To develop a highly diastereoselective radical 1,5 phenyl migration reaction from silicon.
- To explore the transfer of functionalized aryl groups.
- To investigate stereoselective 1,4 aryl migration and alpha-arylation of esters.
Main Methods:
- Radical 1,5 phenyl migration from diarylsilyl ethers.
- Reaction optimization by varying attacking radicals.
- Mechanistic studies and stereochemical modeling.
- Development of a novel alpha-arylation of esters method.
Main Results:
- Achieved highly diastereoselective radical 1,5 phenyl migration to form 3-phenylated alcohols.
- Demonstrated successful transfer of functionalized aryl groups.
- Obtained high yields (up to 81%) and selectivities (up to 95% ds) with nucleophilic secondary alkyl radicals.
- Presented stereoselective 1,4 aryl migration and a new alpha-arylation of esters.
Conclusions:
- Developed an efficient and stereoselective method for aryl group transfer from silicon.
- Established a mechanistic model for predicting stereochemical outcomes.
- Expanded the scope of silicon-mediated radical reactions for complex molecule synthesis.