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Macrocyclic bis(α-amino acids) cis- and trans-2a-b were prepared from the selectively protected tris(hydroxymethyl)aminomethane 3. The X-ray structures of the free bis(amino acids) and/or of the corresponding Cu(II) complexes have been determined allowing an unambiguous configurational assessment. At the same time, conformational in-out dichotomy of the functional groups has been demonstrated in the...
Crowned α-amino acids 7a-c and their dioxopiperazine derivatives 12a-c were prepared from the easily accessible masked tris(hydroxymethyl)aminomethane 1. X-Ray crystal structures of the free as well as alkali metal ion coordinated compounds were investigated.
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