反应详情

3-Ethoxythiophene-2-carbonyl chloride 2, prepared from the reaction of 3-ethoxythiophene-2-carboxylic acid (2.79 g, 16.2 mmol) with oxalyl chloride, was added to a solution of 4-amino-1-methyl-3-n-propylpyrazole-5-carboxamide 1 (2.08 g, 11.4 mmol), DMAP (28 mg, 0.23 mmol) and Et3N (1.64 g, 16.2 mmol) in anhydrous CH2Cl2 (30 mL) at 0° C., and stirred at r.t. for 24 h. The mixture was washed with 1 N HCl and dried with MgSO4. Chromatography (silica gel, hexane:ethyl acetate=3:1) gave a white solid; mp: 103-104° C.; 1H NMR (DMSO-d6) δ 0.87 (t, J=7 Hz, 3 H), 1.39 (t, J=7 Hz, 3 H), 1.56 (sxt, J=7 Hz, 2 H), 2.43 (t, J=7 Hz, 2 H), 3.88 (s, 3 H), 4.32 (q, J=7 Hz, 2 H), 7.18 (d, J=6 Hz, 1 H), 7.66 (s, br. 1 H), 7.75 (s, br. 1 H), 7.81 (d, J=6 Hz, 1 H), 8.87 (s, 1 H); MS (m/z): 337 (MH+).

1. washThe mixture was washed with 1 N HCl
2. dry with materialdried with MgSO4
3. customChromatography (silica gel, hexane:ethyl acetate=3:1) gave a white solid