New processes belonging to the family of pyridazinone.

The present invention relates to a compound belonging to the family of the pyridazin-3-ones fluorinated, for use in the treatment of bronchopulmonary diseases, said compound having the formula (I): or a pharmaceutically acceptable salt of said compound, formula (I ) wherein: R1 is H, alkyl, aryl or heteroaryl; or R2 and R3, independently of one another are H, alkyl, aryl or heteroaryl, or R2 and R3 are bridged within the same cycle or through several cycles; RF is CF3 (CF2) n CF 3 or CF 2 H with n representing an integer between 1 and 7.