2-Methylbenzothiazole → 4-(Sulfobutyl)-2-methylbenzothiazole

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A mixture of 2-methylbenzothiazole (1.49 g, 10 mmol) and 1,4-butane sultone (4.0 g, 30 mmol) was heated in a pressure tube at 130-140° C. for 3 hours. The mixture was allowed to cool to room temperature, and the resulting mass was triturated with ethyl acetate (50 ml) until a gray solid separated. The solid was collected by centrifugation, washed with ethyl acetate and dried under vacuum to yield 2.8 g (96%) of Compound 1.

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