To a stirred solution of 5-pyridin-4-yl-4H-pyrazole-3-carboxylic acid (1.78 g, 9.42 mmol) in DCM (10 ml) was added DIPEA (2.46 ml, 14.1 mmol), EDCI (2.71 g, 9.42 mmol) and HOBt (1.91, 14.1 mmol). 2-(5-(3,4-dichlorophenyl)furan-2-yl)-ethanamine hydrochloride (2.75 g, 9.42 mmol) was dissolved in DCM (15 ml) and DIPEA (1.64 ml, 9.42 mmol). The resulting solution was added to the reaction mixture, which was stirred at RT overnight. The reaction mixture was diluted with DCM and washed with saturated aqueous NaHCO3 solution and water. The organic phase was dried over Na2SO4, evaporated and purified by chromatography (CombiFlash, silica column, eluent 0-15% MeOH/DCM). Product containing fractions were collected, evaporated and crystallized from DCM and re-crystallized from 2% MeOH/DCM and heptane. Thus, 1.18 g (29%) of the title compound was obtained. 1H-NMR (400 MHz; d6-DMSO): δ 2.97 (t, 2H), 3.59 (q, 2H), 6.35 (d, 1H), 7.03 (d, 1H), 7.33 (s, 1H), 7.62 (d, 2H), 7.75 (m, 2H), 7.84 (t, 1H), 8.57 (br s, 1H), 8.63 (m, 2H), 13.95 (s, 1H).
