反应详情

To a solution of 2-(2,6-difluorophenyl)-5-ethoxyoxazole-4-carboxylic acid (0.10 g, 0.37 mmol) and hydroxybenzotriazole monohydrate (0.06 g, 0.39 mmol) in DCM (4 mL) was added PS-carbodiimide resin (0.36 g, 0.45 mmol, 1.25 mmol/g) followed by aniline (39 uL, 0.43 mmol). The resulting mixture was stirred at room temperature for 4 hours when a further portion of aniline (7 uL, 0.08 mmol) was added and the reaction stirred at room temperature overnight. The mixture was filtered through a silica-carbonate cartridge, followed by a MP-TsOH resin cartridge which was rinsed with DCM and MeOH to afford 2-(2,6-difluorophenyl)-5-ethoxy-N-phenyloxazole-4-carboxamide (0.13 g) which was used without further purification. LCMS (1) Rt: 2.30; m/z (ES+) 345.

1. additionwas added
2. filtrationThe mixture was filtered through a silica-carbonate cartridge
3. washwas rinsed with DCM and MeOH