Pyridopyrimidinone compounds, method for production thereof and medicaments comprising the same

Pyridopyrimidone derivatives (I), their enantiomers, diastereoisomers, tautomers, and their salts with acids and bases are new. Pyridopyrimidone derivatives of formula (I), their enantiomers, diastereoisomers, tautomers, and their salts with acids and bases are new. R1, R2 = H or alkyl; R3 = halogen, alkoxy, aryl (optionally substituted by 1-3 R33), or NR'1R'2; R'1, R'2 = H, alkyl, or R'1-N-R'2 is a heterocycle; R4 = H or NR''1R''2; R''1, R''2 = H or alkyl; R1+R2, R'1+R'2, R''1+R''2 = mono or bicyclic of 5 - 11 C heterocycle optionally containing a further 1 or 2 heteroatoms (O, N, S), optionally substituted by 1-3 alkyl groups; R33 = halogens, alkyl, alkoxy, polyhaloalkyl (containing 1 - 3 C atoms and 1 - 7 halogen atoms) and hydroxy; provided that: (1) alkyl and alkoxy groups have 1 - 8 C atoms, aryl is phenyl or naphthyl; and An Independent claim is also included for the preparation of (I).