Abstract
N-G-Acylated argininamides, covering a broad range of lipophilicity (calculated log D values: -1.8-12.5), were synthesized and investigated for NPY Y-1 receptor (Y1R) antagonism, Y1R affinity and stability in buffer (N-G-deacylation, yielding BIBP 3226). Broad structural variation of substituents was tolerated. The K-i (binding) and K-b values (Y1R antagonism) varied from low nM to one-digit mu ...
Abstract
N-G-Acylated argininamides, covering a broad range of lipophilicity (calculated log D values: -1.8-12.5), were synthesized and investigated for NPY Y-1 receptor (Y1R) antagonism, Y1R affinity and stability in buffer (N-G-deacylation, yielding BIBP 3226). Broad structural variation of substituents was tolerated. The K-i (binding) and K-b values (Y1R antagonism) varied from low nM to one-digit mu M. Most of the compounds proved to be sufficiently stable at pH 7.4 over 90 min to determine reliable pharmacological data in vitro. Exceptionally high instability was detected when a succinyl moiety was attached to the guanidine, probably, due to an intramolecular cleavage mechanism. (C) 2010 Elsevier Ltd. All rights reserved.