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Rational synthesis of multicyclic bis[2]catenanes
Anca Bogdan1, Myroslav O Vysotsky, Tomoyuki Ikai
1Fachbereich Chemie und Pharmazie, Abteilung Lehramt Chemie, Johannes Gutenberg-Universität, Duesbergweg 10-14, 55099 Mainz, Germany.
Chemistry (Weinheim an Der Bergstrasse, Germany)
|June 30, 2004
Summary
Researchers synthesized a bis-loop tetraurea calix[4]arene and used it to create a pure bis[2]catenane through a heterodimerization strategy. This method improved yield and purity compared to homodimerization, with the final product
Area of Science:
- Supramolecular Chemistry
- Organic Synthesis
- Macrocyclic Chemistry
Background:
- Calix[4]arenes are versatile macrocyclic platforms with tunable properties.
- Tetraurea calix[4]arenes can form self-assembled structures through hydrogen bonding.
- Catenanes are mechanically interlocked molecular architectures with unique properties.
Purpose of the Study:
- To synthesize novel bis-loop tetraurea calix[4]arene derivatives.
- To investigate the self-assembly and dimerization behavior of these macrocycles.
- To develop an efficient synthetic route to chiral bis[2]catenanes.
Main Methods:
- Acylation of wide-rim calix[4]arene tetraamines under dilution conditions.
- Regioselective homodimerization and heterodimerization of tetraurea calix[4]arenes.
- Olefin metathesis and subsequent hydrogenation for catenane formation.
- Chiral High-Performance Liquid Chromatography (HPLC) for optical resolution.
Main Results:
- Synthesis of bis-loop tetraurea calix[4]arene 6 and bisalkenyl derivative 5.
- Tetraurea calix[4]arene 5 formed a single hydrogen-bonded homodimer in apolar solvents.
- Bis-loop derivative 6 and tetraalkenyl derivative 7a exclusively formed a heterodimer.
- Efficient synthesis of bis[2]catenane 10a in 65% yield via heterodimerization.
- Chirality of the bis[2]catenane 10a was confirmed by chiral HPLC.
Conclusions:
- Heterodimerization of macrocyclic precursors offers a superior strategy for synthesizing pure bis[2]catenanes.
- Steric factors influence the self-assembly and dimerization preferences of tetraurea calix[4]arenes.
- The developed method provides access to enantiomerically pure catenanes.