反应详情

To a solution of 5-fluoro-2-nitrobenzoic acid (370 mg, 2.0 mmol) in anhydrous DMF (5 mL) was added 1-hydroxybenzotriazole hydrate (330 mg, 2.4 mmol), 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride (460 mg, 2.4 mmol) and 2-amino-N-isopropylacetamide (INTERMEDIATE I.1) (230 mg, 2.0 mmol). The resultant mixture was stirred at room temperature for 18 h. The reaction mixture was concentrated in vacuo, the crude yellow residue dissolved in EtOAc (20 mL) and washed with dilute HCl (aq.) (3×5 mL), sat. NaHCO3 (aq.) (3×5 mL) and brine (1×5 mL). The organic layer was dried (Na2SO4), concentrated in vacuo and purified by chromatography on silica gel with MeOH:DCM (1:19, v/v) as eluent to afford 5-fluoro-N-(isopropylcarbamoylmethyl)-2-nitrobenzamide (INTERMEDIATE IV.1) (400 mg, 1.4 mmol, 70%) as yellow solid.

1. concentrationThe reaction mixture was concentrated in vacuo
2. dissolutionthe crude yellow residue dissolved in EtOAc (20 mL)
3. washwashed with dilute HCl (aq.) (3×5 mL), sat. NaHCO3 (aq.) (3×5 mL) and brine (1×5 mL)
4. dry with materialThe organic layer was dried (Na2SO4)
5. concentrationconcentrated in vacuo
6. custompurified by chromatography on silica gel with MeOH:DCM (1:19, v/v) as eluent