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Organolanthanide-catalyzed cyclization/boration of 1,5- and 1,6-Dienes
1Roy and Diana Vagelos Laboratories, Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104-6323, USA. gmolandr@sas.upenn.edu
Organic Letters
|June 29, 2001
Summary
Catalytic samarium diiodide enables cyclization and boration of dienes, yielding cyclic alcohols after oxidation. This method offers a new route for synthesizing valuable organic compounds.
Area of Science:
- Organometallic Chemistry
- Organic Synthesis
- Catalysis
Background:
- Cyclization reactions are fundamental in organic synthesis.
- Boration reactions introduce boron functional groups, enabling further transformations.
- Samarium-based catalysts offer unique reactivity in organic transformations.
Purpose of the Study:
- To develop a novel catalytic cyclization/boration reaction for 1,5- and 1,6-dienes.
- To utilize Cp*2Sm.THF as a catalyst for this transformation.
- To demonstrate the conversion of the resulting organoboranes into primary cyclic alcohols.
Main Methods:
- Reaction of 1,5- and 1,6-dienes with a catalytic amount of Cp*2Sm.THF.
- Isolation and characterization of the intermediate organoboranes.
- Oxidation of the organoboranes to primary cyclic alcohols using standard oxidizing agents.
Main Results:
- Successful cyclization and boration of 1,5- and 1,6-dienes were achieved.
- Cp*2Sm.THF was identified as an effective catalyst for the reaction.
- The resulting organoboranes were efficiently converted to primary cyclic alcohols.
Conclusions:
- Cp*2Sm.THF catalyzes a novel cyclization/boration of dienes.
- This reaction provides a facile route to cyclic organoboranes.
- Subsequent oxidation yields valuable primary cyclic alcohols.