反应详情

温度

180 °C

4-Hydroxy-1-(3-methyl-butyl)-2-oxo-1,2-dihydro-pyrrolo[1,2-b]pyridazine-3-carboxylic acid ethyl ester (Example 1f, 0.040 g, 0.14 mmol) was mixed with 2-amino-benzenesulfonamide (0.0235 g, 0.14 mmol) and the resulting mixture was heated to 180° C. for 20 min. The resulting crude oil was allowed to cool to 25° C. and ethanol (0.5 mL) was added and sonicated to afford a tan precipitate, which was collected and dried in vacuo. The crude solid was dissolved in 1.0 M aqueous potassium hydroxide solution (0.3 mL) and heated to 110° C. for 20 h. The reaction mixture was allowed to cool to 25° C. and 10% aqueous hydrochloric acid solution (0.5 mL) was added and the resulting white precipitate was collected. The solid was washed with methanol and dried in vacuo to afford the desired product, 3-(1,1-dioxo-1,4-dihydro-1λ6-benzo[1,2,4]thiadiazin-3-yl)-4-hydroxy-1-(3-methyl-butyl)-pyrrolo[1,2-b]pyridazin-2-one (0.028 g, 0.07 mmol, 52% yield) as a white solid. 1H NMR (400 MHz, DMSO-d6) δ 0.97 (6H, d, J=6.4 Hz), 1.28 (2H, bs), 1.61 (2H, q, J1=15.2 Hz, J2=6.8 Hz), 1.74 (1H, m), 4.43 (2H, t, J=8.0 Hz), 6.71 (1H, dd, J1=4.4 Hz, J2=2.4 Hz), 7.04 (1H, d, J=4.4 Hz), 7.23 (1H, t, J=8.0 Hz), 7.50 (1H, t, J=7.6 Hz), 7.63 (1H, d, J=8.4 Hz), 7.88 (1H, d, J=8.0 Hz), 7.90 (1H, m); LC-MS (ESI) calcd for C19H20N4O4S 400.45, found 401.28 [M+H+].

1. temperatureto cool to 25° C.
2. customsonicated
3. customto afford a tan precipitate, which
4. customwas collected
5. customdried in vacuo
6. dissolutionThe crude solid was dissolved in 1.0 M aqueous potassium hydroxide solution (0.3 mL)
7. temperatureheated to 110° C. for 20 h
8. temperatureto cool to 25° C.
9. addition10% aqueous hydrochloric acid solution (0.5 mL) was added
10. customthe resulting white precipitate was collected
11. washThe solid was washed with methanol
12. customdried in vacuo