反应详情

Compound 9 (1.63 g, 5 mmol) and NaOH (0.4 g, 10 mmol) were dissolved in water (20 mL) and the solution was stirred for 2 h at room temperature. The pH was adjusted to 3 using 1M HCl, causing precipitation of the product. The precipitate was separated by filtration, washed with water, and dried in vacuo to give 4 as a white solid: yield 1.4 g (95%); MS(+ESI): m/z 298 [M+H]+; 1H NMR (400 MHz, d-DMSO): δ11.682 (s, 1H), 9.11 (s, 1H), 8.81 (s, 1H), 8.52 (s, 1H), 8.09 (d, 2H, J=7.2 Hz), 7.67 (t, 1H, J=7.2 Hz), 7.60 (t, 2H, J=7.2 Hz), 5.16 (s, 2H); 13C NMR (400 MHz, CDCl3): δ169.43, 166.34, 152.89, 152,09, 150.29, 145.63, 133.74, 132.98, 128.45, 122.56, 44.88.

1. customprecipitation of the product
2. customThe precipitate was separated by filtration
3. washwashed with water
4. customdried in vacuo