All combinations between glycine and sarcosine, and between alanine and sarcosine, in a cyclic tetrapeptide have been synthesized; when n.m.r. spectroscopy can be applied, the same cis,trans,cis,trans-conformation, neutral or protonated, is indicated, as long as α-methyl groups do not give rise to steric hindrance.
J. Dale and K. Titlestad, J. Chem. Soc., Chem. Commun., 1972, 255 DOI: 10.1039/C39720000255
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