title: Synthesis and structure of lower rim C-linked N-tosyl peptidocalix[4]arenes.
abstract: Chiral p-tert-butylcalix[4]arenes functionalized at the lower rim with amino acid residues have been prepared. The (1)H and (13)C NMR spectra indicate that the macrocycles preferably adopt a cone conformation. Calix[4]arenes bearing amino acid moieties were prepared as a class of receptors selective for anions that are bound through hydrogen bonding with the NH group. The association constants are dependent on the nature of the substituents at the lower rim. Derivative 9 shows the strongest complexation and the largest selectivity for N-tosyl-(L)-alaninate. Finally, a preliminary X-ray crystal study of the difunctionalized receptor 6f shows the "flattened cone" conformation in the solid state.
authors.affiliation: LACE, CNRS UMR 5634, Université Claude Bernard-Lyon 1, 43 bd du 11 Novembre 1918, F-69622 Villeurbanne Cedex, France.
authors.forename: Sofiane
authors.initials: S
authors.lastname: Ben Sdira
authors.forename: Caroline P
authors.initials: CP
authors.lastname: Felix
authors.forename: Marie-Béatrice A
authors.initials: MB
authors.lastname: Giudicelli
authors.forename: Pascal F
authors.initials: PF
authors.lastname: Seigle-Ferrand
authors.forename: Monique
authors.initials: M
authors.lastname: Perrin
authors.forename: Roger J
authors.initials: RJ
authors.lastname: Lamartine
mesh_terms: D000596:Amino Acids / Q000737:chemistry; D007202:Indicators and Reagents; D009682:Magnetic Resonance Spectroscopy; D013058:Mass Spectrometry; D008958:Models, Molecular; D015394:Molecular Structure; D010636:Phenols / Q000138:chemical synthesis* / Q000737:chemistry; D014105:Tosyl Compounds / Q000138:chemical synthesis* / Q000737:chemistry
chemical_list: D000596:Amino Acids; D007202:Indicators and Reagents; D010636:Phenols; D014105:Tosyl Compounds