反应详情

Intermediate (15b) (19.5 g, 43.4 mmol) was dissolved in pyridine (100 mL, 1 mol). Hydroxylamine hydrochloride (9.0 g, 130 mmol) was added, followed by water (50 mL, 3 mol), and the mixture was stirred at room temperature overnight. Water (100 mL) was then added and the mixture was stirred for 20 minutes. The precipitant was filtered off and dried to yield intermediate (15c) (13.5 g). MS m/z: [M+H+] calcd for C26H28FN3O4, 466.2; found 466.4. 1H-NMR (CDCl3): 9.78 (1H, s), 7.81 (1H, d), 7.48 (2H, m), 7.26 (1H, s), 7.0 (4H, m), 6.20 (1H, d), 5.53 (1H, d), 5.50 (2H, s), 4.55 (2H, q), 1.43 (3H, t), 1.25 (9H, s).

1. stirringthe mixture was stirred for 20 minutes
2. filtrationThe precipitant was filtered off
3. customdried