反应详情

A solution of 4-bromo-2-chlorobenzoic acid (2.00 g, 8.5 mmol), N-hydroxysuccinimide (1.07 g, 9.3 mmol) and EDCl (1.79 g, 9.3 mmol) in tetrahydrofuran/N,N-dimethylformamide (3:1; 40 mL) was stirred at room temperature for 18 h. The reaction was concentrated and water (50 mL) was added. The mixture was extracted with ethyl acetate (3×50 mL) and the combined organic layers were washed with brine, dried (Na2SO4), concentrated, and dried in vacuo to give 1-[(4-bromo-2-chlorobenzoyl)oxy]-2,5-pyrrolidinedione (2.59 g, 92%) as an off-white solid which was used directly in the next step without further purification.

1. concentrationThe reaction was concentrated
2. additionwater (50 mL) was added
3. extractionThe mixture was extracted with ethyl acetate (3×50 mL)
4. washthe combined organic layers were washed with brine
5. dry with materialdried (Na2SO4)
6. concentrationconcentrated
7. customdried in vacuo