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Journal of the American Chemical Society, Vol.117, No.19, 5169-5178, 1995
Structural-Analysis of Beta-Turn Mimics Containing a Substituted 6-Aminocaproic Acid Linker
A series of beta-turn models have been prepared consisting of the dipeptide Ala-Gly cyclized with all stereoisomers of 6-amino-3,5-dimethylcaproic acid and 6-amino-3-methylcaproic acid, as were related peptides based on Gly-Gly and Ala-Ala, The requisite linkers were made using routes featuring stereoselective ring-expansion reactions and the syntheses completed using standard methodology. A preliminary examination of these compounds has been carried out using NMR spectroscopy, circular dichroism, and, in several cases, X-ray crystallography. These studies indicate that, depending on linker stereochemistry, different proportions of type II and type I turns were observed in solution. Both type I and type II turns were observed in the solid state.
Keywords:CYCLIZED DIPEPTIDE MODEL;CONFORMATIONAL FREE-ENERGIES;CIRCULAR-DICHROISM;QUANTITATIVE-ANALYSIS;BIOLOGICAL-ACTIVITY;CHAIN REVERSALS;PEPTIDE MODELS;CYS-NHME;PRO-ASN;DESIGN