METHOD OF OBTAINING OF 3- (1- PYRAZOLYL)- PYRIDAZINE DERIVATIVES

摘要

3-(1-Pyrazolyl)-pyridazine derivatives of the formula I, or pharmaceutically acceptable acid addition salts thereof, which decrease high blood pressure and inhibit catabolism or prostaglandins, (I) wherein R1 is hydrogen or C1-4 alkyl, R2 is hydrogen, cyano, carboxyl, carbamoyl, carbaxoyl or C1-4 alkoxycarbonyl, R3 is hydrogen or chlorine or -NR4NHR5 or NR6R7, wherein R4 and R5 are each hydrogen or C1-4 alkyl, wherein R6 and R7 are each hydrogen or C1-5 alkyl, C1-5 hydroxyalkyl, C3-7 cycloalkyl, phenyl or benzyl, or benzyl or phenylethyl substituted with one or two chlorine atoms or methoxy groups, or a furylmethyl, pyridylmethyl, pyrrolidine or piperazine ring, or when R7 is hydrogen, R6 is -(CH2)n -NR4R5 wherein n is an integer from 1 to 3.