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J Med Chem. 2008 Aug 14;51(15):4780-9. doi: 10.1021/jm8003834. Epub 2008 Jul 4.

Synthesis, structure-activity relationships, and biological profiles of a quinazolinone class of histamine H3 receptor inverse agonists.

Author information

1
Tsukuba Research Institute, Merck Research Laboratories, Banyu Pharmaceutical Co, Ltd, Okubo 3, Tsukuba, Ibaraki 300-2611, Japan.

Abstract

A new series of quinazolinone derivatives was synthesized and evaluated as nonimidazole H 3 receptor inverse agonists. 2-Methyl-3-(4-[[3-(1-pyrrolidinyl)propyl]oxy]phenyl)-5-(trifluoromethyl)-4(3 H)-quinazolinone ( 1) was identified as a promising derivative for further evaluation following optimization of key parameters. Compound 1 has potent H 3 inverse agonist activity and excellent selectivity over other histamine receptor subtypes and a panel of 115 unrelated diverse binding sites. Compound 1 also shows satisfactory pharmacokinetic profiles and brain penetrability in laboratory animals. Two hours after oral administration of 30 mg/kg of 1 to SD rats, significant elevation of brain histamine levels was observed where the brain H 3 receptor was highly occupied (>90%). On the basis of species differences in P-glycoprotein (P-gp) susceptibility of 1 between human and rodent P-gps, the observed rodent brain permeability of 1 is significantly limited by P-gp mediated efflux in rodents, whereas the extent of P-gp mediated efflux in humans should be very small or negligible. The potential of 1 to be an efficacious drug was demonstrated by its excellent brain penetrability and receptor occupancy in P-gp-deficient CF-1 mice.

PMID:
18598020
DOI:
10.1021/jm8003834
[Indexed for MEDLINE]

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