PATENT APPLICATION Entitled : Process for the preparation of pyridazine deri vatives having a psychotropic action, In the names of : Kathleen BIZIERE, Jean-Paul KAN and Camille-Georges WERMUTH. Assignee : Société Anonyme called : SANOFI The present invention relates to a process for the preparation of 4-cyanopyridazine derivatives corresponding to the formula below, which consists in treating an appropriately substituted 4-ethoxycarbonyl-pyridazone with aqueous ammonia, in subsequently treating the resulting pyridazone-4-carboxamide with phosphorus oxychloride and in reacting the 3-chloro-4-cyanopyridazine with an amine of the formula H2N-Alk-? <IMG> (I)
PROCESS FOR THE PREPARATION OF PYRIDAZINE DERIVATIVES HAVING A PSYCHOTROPIC ACTION