Method for the production of 2-(2-ethoxyphenyl)-substituted imidazotriazinones

Process for preparing a compound of the formula (I)

• in which
• R1 represents hydrogen or straight-chain or branched alkyl having up to 4 carbon atoms,
• R2 represents straight-chain alkyl having up to 4 carbon atoms,
• R3 and R4 are identical or different and represent hydrogen, straight-chain or branched alkyl having up to 6 carbon atoms, or represent straight-chain or branched alkoxy having up to 6 carbon atoms,
• comprising reaction of a compound of the formula (II)
• in which R2, R3 and R4 have the meaning indicated above, with a compound of the formula (III)
• in which
• R1 has the meaning indicated above,
• X represents halogen;
• in the presence of a base and, where appropriate, of a metal iodide in an organic solvent to give a compound of the formula (IV)
• in which R1, R2, R3 and R4 have the meaning indicated above, and subsequent reaction
• [A] with iodine in the presence of a base in a solvent, subsequent reaction with a metal cyanide in a solvent and reaction with an acid
• or
• [B] with bromine in acidic medium, subsequent reaction with a metal cyanide in a solvent and reaction with an acid.