反应详情

温度

50 °C

To a solution of 2-({4-[4-(3-bromo-4-fluorophenyl)-5-oxo-4,5-dihydro-1,2,4-oxadiazol-3-yl]-1,2,5-oxadiazol-3-yl}amino)ethyl methanesulfonate (2.13 kg, 4.6 mol, containing also some of the corresponding bromo-compound) in dimethylformamide (4 L) stirring in a 22 L flask was added sodium azide (380 g, 5.84 mol). The reaction was heated at 50° C. for 6 h, poured into ice/water (8 L), and extracted with 1:1 ethyl acetate:heptane (20 L). The organic layer was washed with water (5 L) and brine (5 L), and the solvents removed in vacuo to afford the desired product (1464 g, 77%) as a tan solid. LCMS for C12H8BrFN8O3Na (M+Na)+: m/z=433.0, 435.0. 1H NMR (DMSO-d6, 400 MHz): δ 8.08 (dd, J=6.2, 2.5 Hz, 1H), 7.72 (m, 1H), 7.58 (t, J=8.7 Hz, 1H), 6.75 (t, J=5.7 Hz, 1H), 3.54 (t, J=5.3 Hz, 2H), 3.45 (dd, J=11.1, 5.2 Hz, 2H).

1. extractionextracted with 1:1 ethyl acetate
2. washThe organic layer was washed with water (5 L) and brine (5 L)
3. customthe solvents removed in vacuo