Pyridine-substituted pyrazolopyridine derivatives

Process for the preparation of the compounds of the formula I, comprising the reaction of the compound of the formula (II)

• 24
• A) with a compound of the formula (III)
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• where
• R1 is as defined above;
• if appropriate in an organic solvent, with heating to give the compound of the formula (I);
• or
• B) with a compound of the formula (IV)
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• where
• R1 is as defined above;
• in an organic solvent under heating to compounds of the formula (V)
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• where
• R1 is as defined above;
• subsequently with a halogenating agent to compounds of the formula (VI)
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• where
• R1 is as defined above;
• R2 represent halogen;
• and finally with aqueous ammonia solution under heating and elevated pressure.