Potassium Iodide → 5-{3-[4-(5-Cyanoindol-3-yl)-1,2,5,6-tetrahydropyrid-1-yl]propoxy}-2-methylbenzothiazole

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A mixture of 2-methyl-5-(3-chloropropoxyl)-benzothiazole (3 g, 12.4 mmol), 5-cyano-3-(1,2,3,6-tetrahydropyridin-4-yl)-1H-indole (3 g, 13.4 mmol) and a catalytic amount of potassium iodide in 50 ml of acetonitrile was stirred at 80° C. overnight. The reaction mixture was cooled, diluted with water, ammonium hydroxide and ethyl acetate. The two phases were separated and the aqueous phase was extracted with ethyl acetate twice. The organic phases were combined, washed with brined, dried over sodium sulfate and then concentrated under reduced pressure to a solid. This residual solid was subjected to a silica gel chromatography, eluting with 7% methanol in dichloromethane. Fractions shown to contain product were combined and concentrated to provide 2 g of the title compound in 35% yield as free base. The resulting free base was dissolved in methanol/dichloromethane and precipitated with excess HCl in ether. Recrystalization from ethanol give 1.8 g of the title compound as a light yellow solid. mp. 263-65° C. MS(CI) m+1=429. EA (C25H24N4 OS.1.7HCl): Theory: C, 61.21%; H, 5.28%; N, 11.42%. Found: C, 61.10%; H, 5.43%; N, 11.39%.

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