3-[(2R)-Amino-2-phenylethyl]-1-(2,6-difluorobenzyl)-5-(2-fluoro-3-methoxyphenyl)- 6-methylpyrimidin-2,4-dione (NBI 42902) as a potent and orally active antagonist of the human gonadotropin-releasing hormone receptor. Design, synthesis, and in vitro and in vivo characterization.
J Med Chem
; 48(4): 1169-78, 2005 Feb 24.
Article
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| MEDLINE
| ID: mdl-15715483
Further structure-activity relationship studies of a series of substituted uracils at the 1, 3, and 5 positions resulted in the discovery of several potent antagonists of the human gonadotropin-releasing hormone receptor. Uracils bearing a side chain derived from phenylglycinol at the 3-position were shown to be orally bioavailable in monkeys. 3-[(2R)-Amino-2-phenylethyl]-1-(2,6-difluorobenzyl)-5-(2-fluoro-3-methoxyphenyl)-6-methylpyrimidin-2,4-dione (R-13b, NBI 42902) displayed subnanomolar binding affinity (K(i) = 0.56 nM) and was a potent functional antagonist (IC(50) = 3.0 nM in Ca(2+) flux assay) at the human GnRH receptor. It also bound to the monkey GnRH receptor with high affinity (K(i) = 3.9 nM). In addition, R-13bhad good plasma exposure in cynomolgus monkeys after oral administration, with a C(max) of 737 ng/mL and an AUC of 2392 ng/mL.h at a 10 mg/kg dose. Moreover, oral administration of R-13b to castrated male cynomolgus monkeys resulted in a significant decrease in serum levels of luteinizing hormone. These results demonstrate that compounds from this series of uracils are potent GnRH antagonists with good oral bioavailability and efficacy in nonhuman primates.
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Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Timina
/
Receptores LHRH
Límite:
Animals
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Humans
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Male
Idioma:
En
Revista:
J Med Chem
Asunto de la revista:
QUIMICA
Año:
2005
Tipo del documento:
Article
País de afiliación:
Estados Unidos
Pais de publicación:
Estados Unidos