Disclosed are substituted annulated pyrimidines and triazine compounds of formula (I), wherein the substituents are as define in the specification. The compounds are useful for the treatment and/or prophylaxis of cardiovascular diseases. Examples of a compound of formula (I) are: 2-[1-(2-Fluorobenzyl)-1H-pyrazolo[3,4-b]pyridin-3-yl]-4-(3-hydroxypropyl)-5,5-dimethyl-5,7-dihydro-6H-pyrrolo[2,3-d]pyrimidin-6-one 4-(Aminomethyl)-2-[5-fluoro-1-(2-fluorobenzyl)-1H-pyrazolo[3,4-b]pyridin-3-yl]-5,5-dimethyl-5,7-dihydro-6H-pyrrolo[2,3-d]pyrimidin-6-one acetate