1-AMINO TRIAZOLO[4,3-a]QUINAZOLINE-5-ONES AND OR -5-THIONES INHIBITING PHOSPHODIESTERASE IV

The present invention relates to triazolo[4,3-a]quinazoline-5-ones and 5-thiones of Formula I and Formula II, whereby I and II are position isomers of group R on nitrogen 3 or 4. Optionally, the invention also relates to the racemic forms, isomers and pharmaceutically acceptable salts thereof. The invention further relates to a method for the production thereof and to compositions containing said derivatives. The compounds act as inhibitors of phosphodiesterase IV (PDE-4) and, as such, have utility in treating asthma, chronic bronchitis, acutte pulmonary attack, atopic dermatitis, pulmonary hypertension, pulmonary insufficiency, cardiac insufficiency, psoriasis, inflammatory conditions of the digestive system such as haemorrhagic rectocolitis and Crohn's disease, acute respiratory distress syndrome, acute pancreatitis, benign hypertrophy of the prostate, rheumatoid arthritis, multiple sclerosis, depression, ischaemia-induced neuronal damage, partial cerebral ischaemia, and cancer such as malignant tumor and chronic lymphoid leukemia.