Synthesis and biological evaluation of aroylguanidines related to amiloride as inhibitors of the human platelet Na+/H+ exchanger
摘要:
Pyridine and benzene bioisosteres of amiloride were synthesized and evaluated for their inhibitory Potency against the sodium-hydrogen exchanger (NHE) involved in intracellular pH regulation. The inhibition of NHE was determined by using the platelet swelling assay (PSA) in which the swelling of human platelets was induced by their incubation in an acid buffer (pH 6.7). Additionally, the inhibitory potency of the most active compounds was assessed by measuring the inhibition of the EIPA-sensitive Na-22 (+) uptake (UIA) by human platelets after intracellular acidosis. The results indicated that several benzene derivatives and compounds bearing an carbonylguanidine moiety in the meta position of the pyridine nitrogen were much more potent than amiloride (PSA:IC50 = 43.5 muM, UIA:IC50 = 100.1 muM), but less than EIPA, a pyrazine NHE inhibitor (PSA:IC50=0.08 muM, UIA: IC50 - 0.5 muM). In both biological assays (2-amino-5-bromo-pyridine-3-carbonyl)guanidine (32) was the most active molecule (PSA: IC50 = 0.8 muM, UIA : IC50 = 0.8 muM). Our investigations demonstrated that the replacement of the pyrazine ring of amiloride e by a pyridine ora phenyl ring improved the NHE inhibitory potency (phenyl >pyridine >pyrazine). (C) 2002 Elsevier Science Ltd. All rights reserved.
Ausgehend vom käuflichen 6‐Methyl‐2‐pyridylamin (1) wurde über 12 Stufen das Pyrido[3,2‐e][1,4] diazepin 14a in einer Gesamtausb. von 7% synthestisiert. 14a, das N‐Methyl‐Derivat 14b, das Thiolactam 15a, das Amidin 16 und das anellierte 1,2,4‐Triazol 17 wurden auf Anti‐HIV‐1‐Wirkung geprüft. Keine der geprüften Substanzen besitzt eine dem Zidovudin (3′‐Azido‐3′‐desoxythymidin = AZT) vergleichbare antivirale
6-amino substituted imidazo[4,5-bipyridines as angiotensin II antagonists
申请人:Merck & Co., Inc.
公开号:US05223499A1
公开(公告)日:1993-06-29
Substituted imidazo[4,5-b]pyridines of structural formula: ##STR1## are angiotensin II antagonists useful in the treatment of hypertension and congestive heart failure.