Phosphorus oxychloride → N-(2,6-dichloro-3-methylphenyl)-7-chloro-5-methyl-1,2,4-triazolo[1,5-a]pyrimidine-2-sulfonamide

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Reaction Steps

A solution of 100 ml of phosphoryl chloride in 400 ml of dry acetonitrile was added to 12.0 g (30.9 mmol) of N-(2,6-dichloro-3-methylphenyl)-7-hydroxy-5-methyl-1,2,4-triazolo[1,5-a]pyrimidine-2-sulfonamide and heated to reflux with stirring. After about 24 hours, the mixture became a solution which appeared to contain little or no starting material by thin layer chromatography. The volatiles were largely removed by evaporation under reduced pressure and the residue poured onto about one liter of ice and water with stirring using fresh acetonitrile as a transfer solvent. The solid in the resulting mixture was collected by filtration, washed with water, and dried under reduced pressure at 70° C. overnight. The resulting solid, which was found to be the title compound by NMR analysis, amounted to 8.4 g (67 percent of theory).

Provenance & Evidence