反应详情

2-Amino-6-bromo-4-methoxy-phenol (0.40 g), 1,3-dimethylaminopropyl)-3-ethylcarbodiimide (1.06 g), 1-hydroxybenzotriazole (0.50 g), dimethylaminopyridine (0.22 g) and DL-5-oxo-pyrrolidine-2-carboxylic acid (0.25 g) were reacted together in methylene chloride (7.3 mL). After 3 h, the reaction was diluted with methylene chloride (10 mL) and washed successively with 1N HCl (10 mL), sat. aq. NaHCO3 (10 mL), sat. aq. NaCl (10 mL). The organic layer was dried over sodium sulfate, filtered through celite and concentrated. Chromatography on silica gel (eluant: 0 to 20% methanol:methylene chloride) afforded 5-oxo-pyrrolidine-2-carboxylic acid (3-bromo-2-hydroxy-5-methoxy-phenyl)-amide (0.18 g). MS: 370.2 (100%), 372.2 (90%) (MH+); HPLC tR: 1.51 min. 5-Oxo-pyrrolidine-2-carboxylic acid (3-bromo-2-hydroxy-5-methoxy-phenyl)-amide was cyclized according to synthetic method R to obtain the title compound (0.09 g) after purification on silica gel (eluant: 0 to 30% methanol:methylene chloride). MS: 352.2 (100%), 354.2 (95%) (MH++CH3CN), 311.2 (20%), 313.2 (20%) (MH+).; HPLC tR: 1.84 min.

1. washwashed successively with 1N HCl (10 mL), sat. aq. NaHCO3 (10 mL), sat. aq. NaCl (10 mL)
2. dry with materialThe organic layer was dried over sodium sulfate
3. filtrationfiltered through celite and
4. concentrationconcentrated