反应详情

A solution of N-(2-cyano-3-methylphenyl)sulfamide (Example 24a) (211 mg, 1.0 mmol) in EtOH was treated with NaOH (2.0 N, 1.0 mL, 2.0 mmol) and the resultant solution was heated to 100° C. and stirred at that temperature for 0.5 h. After cooling to room temperature, the clear reaction solution was filtered and the filtration was carefully neutralized with 10% AcOH while with vigorous stirring at 0° C. The resultant precipitate was collected by filtration, washed with warm water and 20% EtOH in water to give the title product 5-Methyl-1H-benzo[c][1,2,6]thiadiazin-4-amine-2,2-dioxide as an off-white solid. 1H NMR (400 MHz, DMSO-d6) δ 2.59 (s, 3H), 6.85-6.87 (d, J=8.4 Hz, 1H), 6.92-6.94 (d, J=7.2 Hz, 1H), 7.24 (s, 1H), 7.37 (t, J=7.6 Hz, 1H), 8.24 (s, 1H), 10.76 (s, 1H). MS 212 (MH+).

1. filtrationthe clear reaction solution was filtered
2. filtrationthe filtration
3. stirringwith vigorous stirring at 0° C
4. filtrationThe resultant precipitate was collected by filtration
5. washwashed with warm water and 20% EtOH in water