✍ Scribed by Claudio Toniolo; Gian Maria Bonora; Alfonso Bavoso; Ettore Benedetti; Benedetto di Blasio; Vincenzo Pavone; Carlo Pedone
No coin nor oath required. For personal study only.
The conformational preferences of linear peptides containing a,a-disubstituted a-amino acids, derived from the crystal structures of 28 compounds, are reviewed. In particular, the sensitivity of peptide conformation to the geometry of these unusual amino acids is underlined. We also consider possible future directions of research, which, we hope, will result in a complete understanding of the structures adopted by peptaibol antibiotics.
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The conformational preferences of the alicyclic C","-disubstituted glycines Ac,c (I-amino-I-cycloalkane-carboxylic acid; n = 4 , 7, 9, 1 2 ) were assessed in selected model compounds, including homopeptides and Ala (or Aib, a-aminoisobutyric acid)lAc,c peptides containing a small total number of res
## Abstract The conformational preference of C^α,α^‐diphenylglycinc (Døg) and C^α,α^‐dibenzylglycine (Dbz) residues was assessed in selected derivatives and small peptides by conformational energy computations, ir absorption, ^1^H‐nmr, and x‐ray diffraction. Conformational energy computations on th
## Abstract The preferred conformation of the C^α,α^‐diphenylglycine residue was determined in simple derivatives and dipeptides. The dipeptides were synthesized by the 5(4__H__)‐oxazolone (from the N‐__para__‐bromobenzoylated amino acid) method. This activated intermediate and a reaction by‐produc
The lipophilic, chiral, C h -methylated h-amino acid L-(h Me)Aoc (2-methyl-2-amino-octanoic acid) was prepared using a chemo-enzymatic approach. Two series of terminally protected model peptides, from dimer through to hexamer, containing L-(h Me)Aoc in combination with either Gly or Aib, were synthe