yl‐2‐pyrazoline derivatives were synthesized and evaluated their for antidepressant, anxiogenic and mammalianmonoamine oxidase (MAO)‐A and Binhibitory activities by in vivo and in vitro tests. MAO was isolated and purified from the mitochondrial pellet of bovine liver homogenates and human platelets. All of the new compounds inhibited the total MAO activity of liver homogenates and the inhibition was