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Appella, D.H., Christianson, L.A., Karle, I.L., Powell, D.R. and Gellman, S.H. (1999) Synthesis and Characterization of Trans-2-Aminocyclohexanecarboxylic Acid Oligomers: An Unnatural Helical Secondary Structure and Implications for β-Peptide Tertiary Structure. Journal of the American Chemical Society, 121, 6206-6212.
http://dx.doi.org/10.1021/ja990748l

has been cited by the following article:

• TITLE: A Theoretical Study of β-Amino Acid Conformational Energies and Solvent Effect

  AUTHORS: Victor F. Waingeh, Felix N. Ngassa, Jie Song

  KEYWORDS: Density Functional Theory, β-Amino Acids, Conformational Search

  JOURNAL NAME: Open Journal of Physical Chemistry, Vol.5 No.4, November 12, 2015

  ABSTRACT: The conformations of four β-amino acids in a model peptide environment were investigated using Hartree-Fock (HF) and density functional theory (DFT) methods in gas phase and with solvation. Initial structures were obtained by varying dihedral angles in increments of 45° in the range 0° - 360°. Stable geometries were optimized at both levels of theory with the correlation consistent double-zeta basis set with polarization functions (cc-pVDZ). The results suggest that solvation generally stabilizes the conformations relative to the gas phase and that intramolecular hydrogen bonding may play an important role in the stability of the conformations. The β3 structures, in which the R-group of the amino acid is located on the carbon atom next to the N-terminus, are somewhat more stable relative to each other than the β2 structures which have the R-group on the carbon next to the carbonyl.