Aza-tanshinone derivatives, process for their preparation and their use in therapy

A compound of formula (I)

• or a salt, solvate or hydrate thereof, wherein:
• R1 is:
• C1-8 alkyl or heteroalkyl;
• C2-6 alkenyl or heteroalkenyl;
• C2-6 alkynyl or heteroalkynyl, all of them optionally substituted;
• aryl, alkylaryl, heteroaryl, or alkylheteroaryl, all of them being optionally substituted;
• R2, R3, R4 are, each independently:
• a hydrogen atom;
• C1-8 alkyl or heteroalkyl;
• C2-6 alkenyl or heteroalkenyl;
• C2-6 alkynyl or heteroalkynyl, all of them being optionally substituted;
• aryl, alkylaryl, heteroaryl, or alkylheteroaryl, all of them being optionally substituted;
• or R3 and R4, together with the carbon atoms to which they are bound, form a 5 or 6 membered cycloalkyl, cycloheteroalkyl, aryl or heteroaryl ring being optionally substituted, being optionally fused with one or more other rings.
• X is C—R5 or N;
• R5 is:
• a hydrogen atom;
• C1-6 alkyl or heteroalkyl;
• C2-6 alkenyl or heteroalkenyl;
• C2-6 alkynyl or heteroalkynyl, all of them being optionally substituted.