Abstract
A simple stereoselective synthesis of cyclic synthons 4a, b and 10a, b, derived from an l-valine unit and an unnatural derivative of the aspartic acid, has been accomplished starting from the chiral synthon 1 and following the procedure already reported by us for the synthesis of similar compounds. These cyclic synthons are interesting substrates because they can behave as both electrophiles and nucleophiles and could be useful starting materials for the preparation of higher peptides such as, for instance, the unnatural tetrapeptides 15 and 18, through the condensation of 4a with 6a or 13 with 17, respectively.
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