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The relationship between chiral centers and the helical‐screw control of their peptides has already been reported, but it has yet to be elucidated in detail. A chiral four‐membered ring α,α‐disubstituted α‐amino acid with a (R,R)‐butane‐2,3‐diol acetal moiety at the γ‐position, but no α‐chiral carbon, was synthesized. X‐ray crystallographic analysis unambiguously revealed that its homo‐chiral heptapeptide...
Right and left hands are generally a mirror image relationship. However, strictly speaking, they are not mirror images because they are not reflections, and moreover, fingerprints, proteins, DNA, and amino acids are not mirror images. Similarly, the four‐membered ring amino acid heptapeptide forming right‐ and left‐handed 310‐helical structures, look like a mirror image peptide backbone. However,...
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