The invention relates to bicyclic heterocycles of general formula (I), in which Ra to Rc, A to E and X are defined as in Claim No. 1, to their tautomers, their stereoisomers and their salts, especially their physiologically compatible salts having inorganic or organic acids or bases. The inventive bicyclic heterocycles comprise valuable pharmacological properties, especially an inhibitory effect on the signal transduction procured by tyrosine kinases. The invention also relates to the use of the inventive bicyclic heterocycles for treating illnesses, especially tumor diseases, diseases of the lung and of the respiratory tract, and relates to the production of the inventive compounds.
