Tiernopirimidinas used as phosphodiesterase inhibitors.

Compounds of formula I wherein R1, R2 indicate, each independently of the other, H, A, OH, OA or Hal, X denotes R4, R5 or R6 substituted by mono-R7 R4 denotes linear or branched alkylene with 1 to 10 C atoms, in which one or two CH2 groups can be replaced by -CH = CH- groups, R5 denotes cycloalkyl or cycloalkylene with 5 to 12 C atoms, R6 denotes phenyl or finilmetilo, R7 denotes COOH, COOA, CONH2, CONHA, CON (A) 2 or CN, A denotes alkyl having 1 to 6 C atoms and Hal denotes F, Cl, Br or I, where at least one of the radicals R1 or R2 denotes OH, and salts of these compounds physiologically acceptable.