Fluoroolefin dipeptide isosteres were synthesized applying the Peterso
n reaction as a novel for fluoroolefination. The dipeptide isosteres w
ere elaborated to provide the conformationally constrained analogs (1-
(R), 1-(S) and 2-(R), 2-(S)) of the Suc-Ala-Gly-Pro-Phe-pNA tetrapepti
de, a synthetic substrate of cyclophilin.