Sulfamide → 5-bromo-3-methyl-3,4-dihydro-1H-benzo[1,2,6]thiadiazine 2,2-dioxide

Participants

Reaction Steps

To a solution of 3-bromo-2-methylaminomethyl-phenylamine from step 3 of Example 3 (2.615 g, 12.2 mmol) in pyridine (50 ml) was added sulfamide (3.5 g, 36.4 mmol). The solution was heated under reflux overnight, and the cooled reaction mixture was partitioned between 2N HCl water solution and ethyl acetate. The organic layer was washed with 2N HCl solution, water, brine. After drying over MgSO4, the organic fraction was concentrated in vacuo and resulting brown residue was purified by flash chromatography to give 5-bromo-3-methyl-3,4-dihydro-1H-benzo[1,2,6]thiadiazine 2,2-dioxide as a white solid. (2.32 g, 69%) MS: (M+H)+ 277.1.

Provenance & Evidence