Methanol → Methyl 3-aminosulfonyl-5-butylamino-4-phenoxybenzoate

Participants

Reaction Steps

To a slurry of bumetanide (1.2 g, 3.29 mmol) in methanol (12 mL) under nitrogen, was added a mixture of thionyl chloride (70 uL) in methanol (6 mL) over 5 minutes. After stirring for 5 minutes the reaction mixture became soluble. The reaction was stirred for an additional 30 minutes, at which time the reaction was complete as determined by thin layer chromatography (TLC). The methanol was removed under reduced pressure and the residue was brought up in ethyl acetate and washed with saturated sodium bicarbonate, water and brine. The ethyl acetate was dried over anhydrous magnesium sulfate and concentrated to yield 1.1 g (89%) of methyl 3-aminosulfonyl-5-butylamino-4-phenoxybenzoate as a white solid.

Provenance & Evidence