| abstract |
1,4-dihydro-pyridazine derivatives of the general formula (I) with substituent definitions for R 1 , R 2 , R 3 and R 4 and X, which are specified in the description, and a process for their preparation by reaction of dihydropyridazines of the formula II with halogenating agents in the presence of inert organic solvents. If necessary, it can then be cyclized. The compounds according to the invention can be used as medicaments. |