Patent ID: 7022709

Claim:
A method for treating a disorder of perception, concentration, learning and/or memory, where said disorder of perception, concentration, learning and/or memory is a result of Alzheimer's disease, comprising administering to a mammal in need of such treatment an effective amount of a selective PDE 2 inhibitor which inhibits human PDE 2 more strongly than it inhibits the human cAMP PDEs 3B, 4B and 7B, and which has the general formula (I) wherein A=D represents N═N, N═CH or CR 5 ═N, in which R 5 denotes hydrogen, methyl, ethyl or methoxy, R 1 and R 2 represent, together with the adjacent carbon atom, hydroxymethylene or carbonyl, and R 3 and R 4 represent independently of one another methyl, ethyl, methoxy, ethoxy or a radical of the formula SO 2 NR 6 R 7 , in which R 6 and R 7 denote, independently of one another, hydrogen, C 1 –C 6 -alkyl, C 3 –C 7 -cycloalkyl, or R 6 and R 7 form, together with the adjacent nitrogen atom, an azetidin-1-yl, pyrrol-1-yl, piperid-1-yl, azepin-1-yl, 4-methylpiperazin-1-yl or morpholin-1-yl radical, or a pharmaceutically acceptable salt thereof.