Journal
CHEMISTRY-A EUROPEAN JOURNAL
Volume 16, Issue 41, Pages 12412-12424Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.201001620
Keywords
configuration determination; formylation; regioselectivity; synthetic methods; tribenzotriquinacenes
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Funding
- National Basic Research Program of China [2010CB833200]
- National Natural Science Foundation of China [20872055, 20972060]
- Specialized Research Fund for the Doctoral Program of Higher Education [20090211110007]
- 111 Project
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Enantiomerically pure tribenzotriquinacenes (TBTQs) bearing two monofunctionalized aromatic nuclei were synthesized for the first time and their optical properties and absolute configuration determined. A remarkably regioselective bis-formylation of the fully bridgehead methylated parent TBTQ hydrocarbon with MeOCHCl2/TiCl4 afforded a mixture of two C-s-symmetrical (achiral) difunctionalized derivatives together with one C-1-symmetrical (chiral) isomer. Reduction and subsequent column chromatography furnished the three respective benzylic TBTQ dialcohols. Optical resolution of the racemic 2,6-bis(hydroxymethyl) derivative was achieved via the diastereomeric (R)-1,1'-bi-2-naphthol ethers and the absolute configuration of the enantiomers was determined by CD exciton model analysis. The electronic circular dichroism (ECD) spectra and the specific rotation of the enantiomers were found to agree with the results of DFT calculations. Among the C-s-symmetrical isomers, the proximal 2,11-dialdehyde and the corresponding benzylic dialcohol were identified by 2D NMR spectroscopy and X-ray crystallographic analysis, respectively, and used as the starting point for the synthesis of several novel dithiametacyclophanes. These include the first dimeric tribenzotriquinacene-based cyclophanes bearing the bowls of the two TBTQ units attached to each other in a syn (concave-concave) or anti (convex-concave) configuration. The usefulness of such thiacyclophanes as fluorescent chemosensors for different metal ions is also demonstrated.
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