反应详情

温度

65 °C

A mixture of 3-(4-bromo-2-fluorobenzylamino)butan-1-ol (800 mg, 2.9 mmol) and Burgess' Reagent (2.07 g, 8.7 mmol) in anhydrous THF (10 mL) was heated at 65° C. for 2 hours. The reaction mixture was concentrated under reduced pressure. The crude product was purified by silica gel chromatography using petroleumn ether/EtOAc (6/1) as eluting solvents to afford methyl 6-[(4-bromo-2-fluorophenyl)methyl]-5-methyl-1,1-dioxo-1λ6,2,6-thiadi-azinane-2-carboxylate as light yellow oil. (900 mg, 79%). 1H NMR (500 MHz, CDCl3) δ 7.45 (t, 1H), 7.17 (d, 1H), 7.25-7.23 (m, 1H), 4.44 (dd, 2H), 4.20-4.25 (m, 1H), 3.92-3.99 (m, 1H), 3.88 (s, 3H), 3.45-3.51 (m, 1H), 1.87-2.00 (m, 2H), 1.23 (d, 3H); LCMS (ESI): m/z=397.0 [M+H]+.

1. concentrationThe reaction mixture was concentrated under reduced pressure
2. customThe crude product was purified by silica gel chromatography
3. washas eluting solvents