Design, synthesis, and biological activity of novel factor Xa inhibitors: 4-aryloxy substituents of 2,6-diphenoxypyridines.
A novel series of triaryloxypyridines have been designed to inhibit factor Xa, a serine protease strategically located in the coagulation cascade. Inhibitor 5e has a K(I) against factor Xa of 0.12nM and is greater than 8000- and 2000-fold selective over two related serine proteases, thrombin and trypsin, respectively. The 4-position of the central pyridine has been identified as a site that tolerates various substitutions without deleterious effects on potency and selectivity. This suggests that the 4-position of the pyridine ring is an ideal site for chemical modifications to identify inhibitors with improved pharmacokinetic characteristics. This investigation has resulted in inhibitor 5d, which has an oral availability of 6% in dogs. The synthesis, in vitro activity, and in vivo profile of this class of inhibitors is outlined.
Ng
Howard P
HP
Pharmaceuticals Research, Berlex Biosciences, 15049 San Pablo Avenue, PO Box 4099, Richmond, CA 94804-0099, USA.
Buckman
Brad O
BO
Eagen
Keith A
KA
Guilford
William J
WJ
Kochanny
Monica J
MJ
Mohan
Raju
R
Shaw
Kenneth J
KJ
Wu
Shung C
SC
Lentz
Dao
D
Liang
Amy
A
Trinh
Lan
L
Ho
Elena
E
Smith
David
D
Subramanyam
Babu
B
Vergona
Ron
R
Walters
Janette
J
White
Kathy A
KA
Sullivan
Mark E
ME
Morrissey
Michael M
MM
Phillips
Gary B
GB
D000284:Administration, Oral; D000818:Animals; D001682:Biological Availability; D002417:Cattle; D004285:Dogs; D015195:Drug Design; D065427:Factor Xa Inhibitors; D005343:Fibrinolytic Agents / Q000138:chemical synthesis; D006576:Heterocyclic Compounds, 4 or More Rings / Q000138:chemical synthesis / Q000493:pharmacokinetics / Q000494:pharmacology; D011725:Pyridines / Q000138:chemical synthesis* / Q000493:pharmacokinetics / Q000494:pharmacology; D051381:Rats; D015842:Serine Proteinase Inhibitors / Q000138:chemical synthesis* / Q000493:pharmacokinetics / Q000494:pharmacology; D013329:Structure-Activity Relationship
D065427:Factor Xa Inhibitors; D005343:Fibrinolytic Agents; D006576:Heterocyclic Compounds, 4 or More Rings; D011725:Pyridines; D015842:Serine Proteinase Inhibitors