Combined 6-hydrazinylnicotinic acid (6.00 g, 39.2 mmol) and ethyl 2-(4-cyanophenyl)-3-(dimethylamino)acrylate (10.05 g, 41.1 mmol) and 2-propanol (80 mL) and treated with 1.85% hydrochloric acid (77 mL, 39.2 mmol). The reaction was stirred at room temperature for 16 h, then Hunig's base (34.1 mL, 196 mmol) was add to the suspension which became homogeneous. The mixture was stirred for 3 h. The reaction mixture was washed with isopropyl acetate (2×150 mL). The combined organic layers were extracted with water (40 mL) and the combined aqueous layers were concentrated in vacuo to give a solid. The solid was triturated with 1N HCl (300 mL), filtered and washed with water (20 mL), then slurried in ethanol (350 mL) and granulated overnight. The solid was collected by filtration and dried in vacuum to give the title compound (9.20 g, 77% yield) as a tan solid. 1H NMR (400 MHz, DMSO-d6) δ ppm 7.79 (d, J=8.34 Hz, 2H) 8.14 (br. s., 2H) 8.47 (d, J=7.07 Hz, 1H) 8.71 (br. s., 2H) 8.97 (s, 1H) 13.44 (br. s., 1H) 13.60 (br. s., 1H). MS [M+H]307.
