There are disclosed 3 [2(substituted alkyl)-3-oxo-2,3-dihydropyridazin-6-yl]-2-aryl pyrazolo [1,5-a]-pyridines useful for treating maladies requiring an adenosine antagonist, and preparative processes.
Pyrazolopyridine compound and processes for preparation thereof
申请人:FUJISAWA PHARMACEUTICAL CO., LTD.
公开号:EP0467248A2
公开(公告)日:1992-01-22
A pyrazolopyridine compound of the following formula:
wherein
R1 is aryl, and
R2 is amino(lower)alkyl; lower alkylamino(lower)alkyl; carboxy(lower)alkylamino(lower)alkyl; protected carboxy(lower)alkylamino(lower)alkyl; lower alkylamino(lower)alkyl having hydroxy and aryloxy; protected amino(lower)alkyl; cyano(lower)alkyl; cyano(higher)alkyl; lower alkyl having heterocyclic group, in which heterocyclic group may have one or more suitable substituent(s); higher alkyl having heterocyclic group, in which heterocyclic group may have one or more suitable substituent(s); ar-(lower)alkyl; lower alkenyl; or heterocyclic group which may have one or more suitable substituent(s),
and a pharmaceutically acceptable salt thereof, processes for their preparation and pharmaceutical compositions comprising them as an active ingredient in admixture with a pharmaceutically acceptable carrier or excipient.
A Novel Series of Non-Carboxylic Acid, Non-Hydantoin Inhibitors of Aldose Reductase with Potent Oral Activity in Diabetic Rat Models: 6-(5-Chloro-3-methylbenzofuran-2-sulfonyl)-2<i>H</i>-pyridazin-3-one and Congeners
作者:Banavara L. Mylari、Sandra J. Armento、David A. Beebe、Edward L. Conn、James B. Coutcher、Michael S. Dina、Melissa T. O'Gorman、Michael C. Linhares、William H. Martin、Peter J. Oates、David A. Tess、Gregory J. Withbroe、William J. Zembrowski
DOI:10.1021/jm050462t
日期:2005.10.1
Discovery of a highly selective, potent, and safe non-carboxylic acid, non-hydantoin inhibitor of aldose reductase (AR) capable of potently blocking the excess glucose flux through the polyol pathway that prevails under diabetic conditions has been a long-standing challenge. In response, we did high-throughput screening of our internal libraries of compounds and identified 6-phenylsulfonylpyridazin-2H-3-one, 8, which showed modest inhibition of AR, both in vitro and in vivo. Initial structure-activity relationships concentrated on phenyl substituents and led to 6-(2,4-dichlorophenylsulfonyl)-2H-pyridazin-3-one, 81, which was more potent than 8, both in vitro and in vivo. Incorporation of extant literature findings with other aldose reductase inhibitors, including zopolrestat, resulted in the title inhibitor, 19m, which is one of the most potent and highly selective non-carboxylic acid, non-hydantoin inhibitors of AR yet described (IC50, 1 nM; ED90 vs sciatic nerve sorbitol and fructose, respectively, 0.8 and 4.0 mg/kg). In rats, its oral bioavailability is 98% and it has a favorable plasma t(1/2) (26 +/- 3 h).
Takahayashi; Honda, Chemical and pharmaceutical bulletin, 1958, vol. 6, p. 722