Ethyl isocyanate → N-[4-(4-Ethyl-5-oxo-4,5-dihydro-1H-[1,2,4]triazol-3-ylmethoxy)-naphthalen-1-yl]-3-fluoro-5-(4-methyl-piperidin-1-yl)-benzamide

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Reaction Steps

To a solution of 3-fluoro-N-(4-hydrazinocarbonylmethoxy-naphthalen-1-yl)-5-(4-methyl-piperidin-1-yl)-benzamide (0.35 g, 0.77 mmol) tetrahydrofuran (10 ml) is added ethylisocyanate (60 mg, 1.1 eq). The mixture is stirred at room temperature for 15 hours before being evaporated to dryness to give the urea intermediate as a solid (0.34 g). MS: 522 (M+1). Urea intermediate (0.1 g, 0.19 mmol) in 5% NaOH (2 ml) is heated at 100° C. for five hours. The mixture is then extracted with ethyl acetate, washed with water, dried over Na2SO4 and evaporated to dryness. The residue is purified by column chromatography on silica gel eluted with ethyl acetate then ethyl acetate containing a few drops of ammonium hydroxide to give N-[4-(4-ethyl-5-oxo-4,5-dihydro-1H-[1,2,4]triazol-3-ylmethoxy)-naphthalen-1-yl]-3-fluoro-5-(4-methyl-piperidin-1-yl)-benzamide as a white solid (21 mg). Mp: 240-241° C. 1H NMR (300 MHz, DMSO-d6) δ 11.88 (s, 1H), 10.27 (s, 1H), 8.16 (d, J=5.1 Hz, 1H), 7.88 (d, J=4.5 Hz, 1H), 7.57-6.95 (m, 7H), 5.27 (s, 2H), 3.78 (m, 4H), 2.77 (t, J=11.4 Hz, 2H) 1.68 (m, 3H), 1.20 (brs, 6H), 0.95 (brs, 3H). MS: 504 (M+1).

Provenance & Evidence