The solution-phase synthesis and cyclisation of three α,β-peptoid octamers with differing side chain patterns is reported. One of these, compound C , showed a significantly greater resolution by NMR relative to the other two structurally related octamers. This observation was studied in detail by circular dichroism at a synchrotron light source to facilitate the correlation between the side chain patterns and conformational preference of these three peptoids. The X-ray crystal structure of cyclic octamer C , the first high-resolution structure for the α,β-peptoid backbone, was also obtained from methanol. Combined solid- and solution-phase studies allowed the identification of the N -2-(benzyloxy)ethyl side chain on the β-residue of the heterogeneous backbone as a key structural feature driving the increased conformational stability for octamer C .
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