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Synthesis of Catenane Structures via Ring-Closing Metathesis
Marcus Weck1, Bernhard Mohr, Jean-Pierre Sauvage
1Arnold and Mabel Beckman Laboratories of Chemical Synthesis, Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, California 91125, and Laboratoire de Chimie Organo-Minérale, UMR 7513 au CNRS, Faculté de Chimie, Université Louis Pasteur, 4, rue Blaise Pascal, 67070 Strasbourg.
The Journal of Organic Chemistry
|October 25, 2001
Summary
Researchers developed a straightforward six-step synthesis for [2]catenanes, a type of molecular knot. This accessible method utilizes ring-closing metathesis and yields highly pure catenane architectures from readily available starting materials.
Area of Science:
- Supramolecular Chemistry
- Organic Synthesis
- Metallocycle Chemistry
Background:
- Catenanes are mechanically interlocked molecular architectures with unique properties.
- Efficient synthetic routes to catenanes are crucial for exploring their potential applications.
Purpose of the Study:
- To develop a facile and high-yielding synthetic strategy for [2]catenanes.
- To demonstrate the accessibility of catenane synthesis using ring-closing metathesis.
Main Methods:
- Design of phenanthroline-based ligands with terminal olefinic units for copper coordination.
- Tetrahedral copper complex assembly followed by ruthenium-catalyzed ring-closing metathesis.
- Demetalation and hydrogenation steps to obtain catenanes and saturated catenands.
Main Results:
- High yields (88-92%) of [2]catenates were achieved using ruthenium catalyst 1.
- Nearly quantitative yields of [2]catenands were obtained after demetalation.
- A six-step synthesis from commercially available 1,10-phenanthroline provides overall access to catenanes with 51% yield.
Conclusions:
- The described method provides a highly accessible route to [2]catenanes.
- Ring-closing metathesis is an effective strategy for constructing catenane architectures.
- The synthesis is efficient, scalable, and utilizes readily available precursors.