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A series of pentapeptide derivatives containing α,α‐disubstituted α‐amino acids have been prepared by a combination of the ‘azirine/oxazolone method’ and segment condensations. X‐Ray crystal‐structure determinations of the molecular structures confirmed the presence of helical conformations stabilized by β‐turns of type III or III′. Pentapeptides containing (R)‐Phe(2Me) form a right‐handed helix,...
The two segments, 1–9 and 10–16, of the peptaibol antibiotic antiamoebin I, i.e., the nonapeptide Ac‐Phe‐Aib‐Aib‐Aib‐D,L‐Iva‐Gly‐Leu‐Aib‐Aib‐OH (15) and the heptapeptide Z‐Hyp‐Gln‐D,L‐Iva‐Hyp‐Aib‐Pro‐Pheol (34), have been prepared as mixtures of the epimers containing D,L‐Iva. All α,α‐disubstituted α‐amino acids were introduced by the ‘azirine/oxazolone method’, in which amino or peptide acids are...
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