Résumé
The direct conversion of cysteine (Cys) containing peptides into conformationally constrained pseudo-proline (ΨPro) derivatives by intraresidual
N,
S-acetalisation has been achieved. This post-synthetic modification represents a versatile tool in structure–activity studies of bioactive peptides as exemplified for the immunosuppressive cyclosporine A (CsA) analogue [D-Cys]
8CsA.
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