反应详情

To a mixture of 3-amino-4-hydroxybenzonitrile (1.84 g, 0.0137 mol) in acetonitrile (140 mL) was added 4-bromophenyl isothiocyanate (2.93 g, 0.0137 mol) at room temperature. The mixture was stirred for 16 hours at room temperature. Cuprous chloride (1.36 g, 0.0137 mol) and triethylamine (1.9 mL, 0.0137 mol) were added to the reaction mixture. The mixture was stirred for 16 hours at room temperature. The solvent was removed under reduced pressure, and the solid was suspended in methanol. The mixture was filtered through celite pad using methanol. The brownish filtrate was left at 4° for three days. The precipitate was filtered and washed with methanol to yield 2-(4-bromoanilino)-1,3-benzoxazole-5-carbonitrile (2.4 g, 0.0076 mol). RP-HPLC (Delta Pak C18, 5 μm, 300 A, 15 cm; 5%-95% acetonitrile-0.1M ammonium acetate over 10 min, 1 mL/min) Rt 11.1 min. MS: MH: 313

1. stirringThe mixture was stirred for 16 hours at room temperature
2. customThe solvent was removed under reduced pressure
3. filtrationThe mixture was filtered through celite pad
4. waitThe brownish filtrate was left at 4° for three days
5. filtrationThe precipitate was filtered
6. washwashed with methanol