The efficient assembly of an 18-membered macrocyclic peptide core was realized by a straightforward and convergent approach utilizing ring-closing metathesis of the corresponding linear tetrapeptides as the key transformation. This approach allowed for the facile preparation of a focused library of novel macrocycles that culminated in the discovery of a cyclophilin A inhibitor with a Kd=5.4μM.
Keywords: Cyclophilin; Macrocycle; Peptidyl-prolyl isomerases; Ring-closing metathesis.
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