Reaction Steps
To a mixture of ethyl 3-aminopropanoate hydrochloride (46 mg, 0.3 mmol), 4-(1-(2-methyl-4-(4-(trifluoromethyl)-1H-pyrazol-1-yl)phenoxy)butyl)benzoic acid (84 mg, 0.2 mmol), HOBt hydrate (34 mg, 0.22 mmol), and DIPEA (0.133 ml, 0.8 mmol), and THF (3 ml) was added EDCl hydrochloride (62 mg, 0.32 mmol) in one portion at the ambient temperature and the reaction was stirred at the same temperature for three days. The mixture was diluted with 3 ml of ethyl acetate, 3 ml of heptanes, and washed successively with saturated aqueous sodium bicarbonate and brine, dried over anhydrous magnesium sulfate, and loaded on silica gel. Chromatography on a silica gel column, eluting with a gradient from 10% to 50% of ethyl acetate in heptane gave the target product as a colorless gum (55 mg, 53%). 1H NMR (500 MHz, CDCl3) δ 8.01 (s, 1H), 7.84 (s, 1H), 7.75 (d, J=8.29 Hz, 2H), 7.45 (d, J=2.68 Hz, 1H), 7.40 (d, J=8.05 Hz, 2H), 7.20 (dd, J=2.68, 8.78 Hz, 1H), 6.81-6.87 (m, 1H), 6.61 (d, J=8.78 Hz, 1H), 5.21 (dd, J=5.12, 7.56 Hz, 1H), 4.18 (q, J=7.16 Hz, 2H), 3.73 (q, J=6.02 Hz, 2H), 2.64 (t, J=5.85 Hz, 2H), 2.40 (s, 3H), 2.00-2.10 (m, 1H), 1.81-1.90 (m, 1H), 1.52-1.61 (m, 1H), 1.44-1.51 (m, 1H), 1.28 (t, J=7.20 Hz, 3H), 0.98 (t, J=7.44 Hz, 3H). MS (M+1): 5182.
