[EN] PYRIDAZIN-3 (2H) -ONE DERIVATIVES AND THEIR USE AS PDE4 INHIBITORS<br/>[FR] DERIVES DE PYRIDAZINE-3(2H)-ONES ET UTILISATION EN TANT QU'INHIBITEURS DE PDE4
申请人:ALMIRALL PRODESFARMA SA
公开号:WO2005049581A1
公开(公告)日:2005-06-02
New pyridazin-e-(2H)-one derivatives having the chemical structure of general formula (I) are disclosed; as well as processes for their preparation, pharmaceutical compositions comprising them and their use in therapy as inhibitors of phosphodiesterase 4.
base-catalyzed cascade nucleophilic/aza-Michael addition reaction of N-alkoxy β-oxo-acrylamides with isocyanates has been developed to afford various highly functionalized hydantoin derivatives in 80–98% yields under mild reaction conditions. The intriguing features of this method include metal-free reaction conditions, low catalyst loading, broad substrate scope and short reaction time.