Benzyl isocyanate → 1-Benzyl-3-{5-[4-(2-trifluoromethylbenzoyl)piperazin-1-YL]pyridin-2-YL}urea

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To a solution of [4-(6-aminopyridin-3-yl)piperazin-1-yl]-(2-trifluoromethylphenyl)-methanone (0.035 g, 0.12 mmol) in dichloromethane (3 mL) was added benzylisocyanate (0.4 mL, 0.3 mmol). After stirring for 66 h, dichloromethane was removed in vacuo and the residue was diluted with ethyl acetate (20 mL). The organic phase was washed with brine, dried over anhydrous MgSO4 and concentrated in vacuo. Purification by preparative thin layer chromatography afforded the title compound as a pale white solid (14.6 mg, 30% yield). 1H NMR (300 MHz, CDCl3) δ 9.61, 8.78, 7.73, 7.58, 7.25, 6.78, 4.59, 3.95, 3.32, 3.13, 2.94. MS (ES+) m/z 484.0 (M+1).

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