1,2-Dimethylpropylamine → 6-chloro-N-(3-methylbutan-2-yl)-1,1-dioxo-4H-thieno[3,2-e][1,2,4]thiadiazin-3-amine

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A solution of 3,6-dichloro-4H-thieno[3,2-e]-1,2,4-thiadiazine 1,1-dioxide (0.5 g, 1.94 mmol) in 1,2-dimethylpropylamine (5 ml) was stirred for 48 h at 100° C in a sealed flask. The cooled mixture was concentrated in vacuo and the residue was stirred with water (20 ml) followed by adjustment to pH 2 with 4M hydrochloric acid. The initially formed gummy product crystallised by stirring the mixture for about 2 h at 0° C. The precipitate was isolated by filtration, washed with water, and recrystallised from ethyl acetate/methanol followed by drying in vacuo at 60° C. over night to give 0.43 g (72%) of the pure title compound.

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