Water → N-(n-butyl)-1,2,3,4-tetrahydro-2,3-dioxo-6-quinoxaline sulfonamide

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Reaction Steps

To a solution of 7.31 g (0.1 mole) of n-butylamine in 20 ml of water 5.21 g (0.02 mole) of 1,2,3,4-tetrahydro-2,3-dioxo-6-quinoxalinesulfonyl chloride are added, and the mixture is stirred at room temperature for 5 hours. Then it is allowed to stand for 16 hours, the separated crystals are filtered off, washed with water, dried and recrystallized from acetone. Thus 4.50 g (76%) of N-(n-butyl)-1,2,3,4-tetrahydro-2,3-dioxo-6-quinoxaline sulfonamide are obtained, m.p.: 257-262° C.

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