Chloroacetonitrile → benzyl 3-(7-bromo-1-cyanomethyl-3-methyl-1H-indol-6-ylmethoxy)-4-{4-[3-(2-methoxybenzyloxy)propoxy]phenyl}piperidine-1-carboxylate

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The solution of 3.38 g of benzyl 3-(7-bromo-3-methyl-1H-indol-6-ylmethoxy)-4-{4-[3-(2-methoxybenzyloxy)propoxy]phenyl}piperidine-1-carboxylate (Example 21b) in 46 ml of DMPU is admixed with stirring at 0° C. with 0.367 g of sodium hydride dispersion (60%). The mixture is stirred at 0° C. over 30 minutes and then admixed with 0.323 ml of chloroacetonitrile and 0.172 g of tetrabutylammonium iodide. The reaction mixture is stirred at room temperature over 16 hours, poured onto 1M ammonium chloride solution and extracted with tert-butyl methyl ether (2×300 ml). The organic phases are washed successively with water (300 ml) and brine (300 ml), dried over sodium sulphate, filtered and concentrated by evaporation. The title compound is obtained as a white foam from the residue by means of flash chromatography (SiO2 60F). Rf=0.33 (1:1 EtOAc-heptane); Rt=6.10.

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