PROCESS FOR PRODUCING PYRIDAZIONON DERIVATIVES, THEIR SALTS AND PHARMACEUTICAL PREPARATIONS CONTAINING SAME

摘要

Pyridazinone derivs. of formula (I) are new. (R1, R2 and R3 are H, OH or less than 5C alkoxy; two of R1, R2 and R3 in combination may form -O-CH2-O- or -O-CH2CH2-O-; R4 is alkyl; n is 0-4; dotted line denotes single bond or double bond). A typical (I) is 6-(4-(4-(4-methoxybenzyl) -1-piperazinylcarbonyl) phenyl)-4,5-dihydro- 5-methyl-3(2H)-pyridazinone.