Water → 6-Thiophen-3-yl-2-(2-trimethylsilanylethoxymethyl)-4-[1-(2-trimethylsilanyl-ethoxymethyl)-1H-benzimidazol-2-yl]-2H-pyridazin-3-one

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44 mg of 6-chloro-2-(2-trimethylsilanylethoxymethyl)-4-[1-(2-trimethylsilanyl-ethoxymethyl)-1H-benzimidazol-2-yl]-2H-pyridazin-3-one, 14 mg of thiophene-3-boronic acid and 36 mg of potassium carbonate are dissolved 1.5 ml of a 1:2 mixture of water and dimethoxyethane, and argon is passed through the solution for degassing. Addition of 7 mg of (1,1′-bis(diphenylphosphine) -ferrocene)palladium(II) chloride-dichloromethane complex is followed by stirring at 85° C. for 4 hours. For workup, it is diluted with water and extracted several times with ethyl acetate. The combined organic phases are dried using a silica gel cartridge, and the solvent is distilled off. The crude product is purified by silica gel chromatography (n-heptane/ethyl acetate).

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