The present invention provides the compounds of formula (I) and the pharmacologically acceptable salts of these compounds, where x1, X2, X3, Y1, Y2, R1 and R3 are defined in descriptive memory, the preparation process, the pharmacological components limiting these compounds and their use in treatment. These compounds are PHD inhibitors.La presente invencion proporciona compuestos de la formula (I) y sales farmaceuticamente aceptables de estos, en la que X1, X2, X3, Y1, Y2, R1 y R3 son tal como se define en la memoria descriptiva, procesos para su preparacion, composiciones farmaceuticas que los continene y su uso en terapia. Estos compuestos son inhibidores de PHD.
