作者:Enrique Mann、Ana Montero、Miguel A. Maestro、Bernardo Herradón
DOI:10.1002/1522-2675(200211)85:11<3624::aid-hlca3624>3.0.co;2-y
日期:2002.11
1,1'-Biphenyl derivatives with amino acid/peptide substitution at C(2) and C(2') ('peptide-biphenyl hybrids', 6-8) have been prepared by direct N-acylation of amino acid/peptide derivatives with 1,1'-biphenyl-2,2'-dicarbonyl dichloride (5). Both conformers, which arise from the rotation around the aryl - aryl bond, have been detected by H-1-NMR spectroscopy. Single atropisomers of each 6 ((R)-configuration at the stereogenic axis) and 7 ((S)-configuration at the stereogenic axis) have been obtained in quantitative yield by slow evaporation of methanolic solutions. The procedures are dynamic atropselective resolutions (asymmetric transformations of the second kind). The crystal structures of the peptide-biphenyl hybrids 6 and 7 show highly ordered molecular and supramolecular structures with extensive intramolecular and intermolecular H-bonding.