Journal of Medicinal Chemistry p. 4393 - 4407 (1992)
Update date:2022-08-02
Topics:
Alig
Edenhofer
Hadvary
Hurzeler
Knopp
Muller
Steiner
Trzeciak
Weller
The tetrapeptide H-Arg-Gly-Asp-Ser-OH (1) (RGDS), representing a recognition sequence of fibrinogen for its platelet receptor GP IIb-IIIa (integrin α(IIb)β3), served as lead compound for the development of highly potent and selective fibrinogen receptor antagonists. Replacement of the N- terminal arginine by p-amidinophenylalanine or the Gly moiety by m- aminobenzoic acid led to compounds which are superior to the lead peptide with regard to activity and selectivity for GP IIb-IIIa vs the closely related vitronectin receptor α(v)β3. By random screening [(p- amidinobenzenesulfonamido)ethyl]-p-phenoxyacetic acid derivatives have been identified as fibrinogen receptor antagonists. Further structure-activity relationship studies culminated in the preparation of N-[N-[N-(p- amidinobenzoyl)-β-alanyl]-L-α-aspartyl]-3-phenyl-L-alanine (29h, Ro 43- 5054) and [[1-[N-(p-amidinobenzoyl)-L-tyrosyl]-4-piperidinyl]oxy]acetic acid (37f, Ro 44-9883), which exhibit very high activity as platelet aggregation inhibitors (IC50s 0.06 and 0.03 μM, respectively, human PRP/ADP) as well as marked selectivity for GP IIb-IIIa vs α(v)β3. Since the activity of 37f in dogs declines according to a two-compartment model with an initial phase having a t( 1/2 ) of 8 min and a second phase with a t( 1/2 ) of 110 min, this compound is a suitable candidate for the development as iv platelet inhibitor.
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