反应详情

The product from Step (a) above (3.6 g, 20.2 mmol) was dissolved in pyridine (30 mL), acetic anhydride (4.15 mL, 44 mmol) was added and the mixture was stirred overnight at rt. The red solution was pouted into H2O and the resulting solid was filtered to give the title compunt as a red solid (4.8 g, 91%). NMR 1H NMR (400 MHz, DMSO-D6) δ 11.21 (br s, 1H), 9.08 (s, 1H), 8.46 (s, 2H), 2.51 (s, 3H), 2.23 (s, 3H) (MS m/z 263.2.0 [M+H]+

1. filtrationthe resulting solid was filtered