反应详情

To a stirred solution of 3-hydroxy-1-naphthalenecarboxylic acid (6.67 g, 35.4 mmol) and oxalyl chloride (3.86 mL, 44.2 mmol) in DCM (150 mL) was added 3 drops of DMF. The mixture was stirred at room temperature for 3 h., the solvent was removed under reduced pressure and methanol (150 mL) was added. After stirring at reflux for 15 min the solvent was removed under reduced pressure, the residue was purified by column chromatography (10%, 20% and 30% EtOAc/hexane) to give the title compound as a yellow solid (2.5 g, 35%). 1H NMR (DMSO-d6) δ 10.10 (s, 1H), 8.61 (d, 1H), 7.77 (d, 1H), 7.72 (d, 1H), 7.47 (m, 2H), 7.38 (d, 1H), 3.93 (s, 3H); MS m/z 201.1 (M−H).

1. customthe solvent was removed under reduced pressure and methanol (150 mL)
2. additionwas added
3. stirringAfter stirring
4. temperatureat reflux for 15 min the solvent
5. customwas removed under reduced pressure
6. customthe residue was purified by column chromatography (10%, 20% and 30% EtOAc/hexane)