Hydrazono-malonitrile derivatives of the formula (I) in which R
1
, R
2
, R
3
, R
3
′ and R
4
have the meanings given in claim 1 act as phosphodiesterase IV inhibitors and can be employed for the treatment of osteoporosis, tumours, cachexia, atherosclerosis, rheumatoid arthritis, multiple sclerosis, diabetes mellitus, inflammatory processes, allergies, asthma, autoimmune diseases, myocardial diseases and AIDS.
1
式(I)中的Hydrazono-malonitrile衍
生物,其中R1、R2、R3、R3'和R4具有权利要求1中所给出的含义,可作为
磷酸二酯酶IV
抑制剂,并可用于治疗骨质疏松症、肿瘤、消瘦症、动脉硬化、类风湿性关节炎、多发性硬化症、糖尿病、炎症过程、过敏、哮喘、自身免疫性疾病、心肌疾病和艾滋病。