Oligomers derived from dipeptide mimics were selected by computational study for their suitability to fold in ordered structures. After selection of a monomeric unit, short oligomers were synthesized and analyzed by NMR and IR. Oligomers built from 2-aminomethyl-phenyl-acetic acid were shown to adopt a helical structure stabilized by 10-membered ring hydrogen bonds. (c) 2007 Elsevier Ltd. All rights reserved.
Comparison of diffusion coefficients for matched pairs of macrocyclic and linear molecules over a drug-like molecular weight range
作者:Andrew R. Bogdan、Nichola L. Davies、Keith James
DOI:10.1039/c1ob05996c
日期:——
The diffusion coefficients of a series of closely matched pairs of macrocyclic and linear molecules have been compared using NMR spectroscopy. The macrocyclic series was designed both to overlap with and extend beyond the molecular weight range typically employed for drug-like molecules. The linear molecules each represent a carbogenic fission of their macrocyclic counterparts, designed to minimize differences in functionality and physicochemical properties. Each series of molecules was prepared using copper catalyzed azide-alkyne cycloaddition (CuAAC) reactions conducted in a flow using a copper tube. The macrocyclic series exhibited consistently higher diffusion across the entire molecular weight range studied. The fold difference in diffusion coefficients between the macrocyclic and linear analogues appeared to be independent of either solvent viscosity or dielectric environment.