The present invention relates to novel compounds that inhibit Lp-PLA2 activity, processes for their preparation, to compositions containing them and to their use in the treatment of diseases associated with the activity of Lp-PLA2, for example atherosclerosis, Alzheimer's disease, and/or diabetic macular edema.COMPUESTOS DERIVADOS DE PIRIMIDINONA SUSTITUIDA, INHIBIDORES DE LA FOSFOLIPASA ASOCIADA CON LIPOPROTEINAS A2 (LP-PLA2); COMPOSICION FARMACEUTICA QUE LOS COMPRENDE; UTILES PARA TRATAR LA ENFERMEDAD DE ALZHEIMER Y LA ATEROSCLEROSIS.