Bumetanide → HCID 16657175, compound

Participants

Reaction Steps

A mixture of 3-n-butylamino-4-phenoxy-5-sulphamyl-benzoic acid (1 g), chloroacetonitrile (0.625 g), triethylamine (0.28 g), and dry acetone (10 ml) was refluxed for 19 hours. After cooling, the precipitated triethylamine hydrochloride was removed by filtration, and the filtrate was evaporated in vacuo. To the residue, water (20 ml) and ethylacetate (50 ml) were added, and the pH of the aqueous layer was adjusted to pH 7.5. The organic layer was then separated, washed with dilute sosium hydrogen carbonate, dried, and evaporated in vacuo. The residue was recrystallized several times from chloroform/petroleum ether. Thereby the cyanomethyl-3-n-butylamino-4-phenoxy-5-sulphamyl-benzoate was obtained with a melting point of 159°-161° C.

Provenance & Evidence