| 摘要 |
<p>A thiazole derivative of the formula (I):wherein R is 1-optiona lly substituted-6-oxo-1,6-dihydro-3-pyridazinyl, R' is an optionally substituted phenyl, and R2 is hydrogen, a group of the formula (i): wherein R4 is hydrogen, lower alkyl or lower alkenyl, and R5 is hydrogen, optionally substituted lower alkyl, acyl, cyclo(lower)alkyl, lower alkenyl, optionally substituted aryl or heterocyclic, or a group of the formula (ii): wherein X is oxygen or sulfur, R8 is hydrogen or lower alkyl, R9 is hydrogen, optionally substituted lower alkyl, cyclo(lower)alkyl, lower alkoxy or mono- or di-lower alkylamino or R?8 and R9¿ may be combine together to form optionally substituted saturated N-containing heterocyclic, or a salt thereof._The compounds are useful as Adenosine antagonists. The application also discloses an improved process for the preparation of pyridazinones (XII-1)</p> |
