A mixture of 0.477 g of 1-(4-bromo-benzene-sulfonyl)-4-methyl-piperidine, 0.42 g of bis-(pinacolato)-diboron, 0.025 g of 1,1′-bis-(diphenylphosphino)-ferrocene, 0.033 g of [1,1′-bis(diphenylphosphino)ferrocene]palladium-dichloride (complex with CH2Cl2), 0.442 g of potassium acetate in 6 ml of degassed dioxane are heated to 85° C. in a sealed tube under N2 for 6 hours. To the resulting mixture 5 ml of degassed dioxane, 0.342 g of 2-[2-(4-methoxypyridin-2-yl)ethyl]-6-iodo-3H-imidazo[4,5-b]pyridine (starting material A1), 0.104 g of tetrakis(triphenylphosphine)-palladium(0) and a solution of 0.25 g of potassium carbonate and 0.076 g of lithium chloride in 3 ml of degassed water are added under N2. The tube is sealed again, the mixture is heated to 110° under N2 for 17 hours and, after cooling, addition of water and adjusting the pH to 7, it is extracted three times with dichloromethane. The combined organic phases are dried over sodium sulfate and concentrated. Crystallization of the residue from ethylacetate and recrystallization from acetonitril gives 0.185 g of the title compound as a solid of m.p. 186-188° C. The mass spectrum shows the molecular peak MH+ at 492.4 Da.
