反应详情

In a 20-mL screw-cap vial, 250 mg (0.75 mmol) 2-(2-chlorophenyl)-1-(4-chlorophenyl)-1H-imidazole-4-carboxylic acid, 18.3 mg DMAP (0.15 mmol), 1.25 g PS-Carbodimide (1.5 mmol) (polystyrene-supported cyclohexylcarbodiimide, Argonaut Technologies Inc., San Carlos, Calif.), 169 mg α,α,α-trifluoro-p-toluenesulfonamide (0.75 mmol), and 12 mL dichloromethane were added, and the reaction mixture was mixed by orbital shaking at rt overnight. The reaction mixture was filtered through a filter tube (polypropylene frit), and the filtrate was evaporated under reduced pressure. The crude product was redissolved in 2 mL MeOH and purified by preparative HPLC to give 39.3 mg of N-{[2-(2-chlorophenyl)-1-(4-chlorophenyl)-1H-imidazol-4-yl]carbonyl}-4-(trifluoromethyl)benzenesulfonamide (beige solid, 10% yield). 1H NMR (400 MHz, CD3COCD3) δ 8.25 (d, 2 H), 7.85 (s, 1 H), 7.75 (s, 2H), 7.20-7.40 (m, 6 H), 6.95 (t, 2 H); LC-MS m/z 540 (MH+), retention time 3.36 min (method 2).

1. customIn a 20-mL screw-cap vial
2. additionthe reaction mixture was mixed
3. filtrationThe reaction mixture was filtered through a filter tube (polypropylene frit)
4. customthe filtrate was evaporated under reduced pressure
5. dissolutionThe crude product was redissolved in 2 mL MeOH
6. custompurified by preparative HPLC