Reduced symmetry triflate-resorcin[4]arenes
The synthesis of C2v-symmetric resorcin[4]arenes with four triflate substituents was investigated, and a number of examples were structurally characterised by X-ray crystallography. Starting from a readily prepared resorcin[4]arene octol, the reduction in the symmetry to
C2v is achieved via the known regioselective tetra-substitution reaction with tosyl chloride. The remaining four hydroxyl groups can be either converted to triflates, or protected as methoxy groups allowing clean hydrolysis of the tosylates to a tetramethoxyresorcin[4]arene tetrol,
ready for further functionalisation including triflate incorporation. Synthesis and structural characterisation of the first octa(triflate)resorcin[4]arene are also reported. Aryl triflates are known to be reactive in a number of cross-coupling reactions, and thus, the triflate-resorcin[4]arenes
reported herein are promising precursors for functionalisation of the upper rim of these cavitand hosts.
Keywords: cavitand; resorcinarene; sulphonate; triflate
Document Type: Research Article
Affiliations: Department of Chemistry,University of Otago, Dunedin,9054, New Zealand
Publication date: 01 August 2012
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