The invention relates to compounds of formula (I), 
in which R1, R2 and R3 are as defined in the description, their use as medicaments, the process for their preparation and their use for the treatment of pathologies in which therapy by a PDE4 inhibitor is relevant.
                            该发明涉及式(I)的化合物,其中R1、R2和R3如描述中所定义,它们作为药物的用途,它们的制备过程以及它们用于治疗需要PDE4
抑制剂治疗的病理情况的用途。