Pyridine → 2-Chloro-4-fluoro-5-[3,6-dihydro-3-methyl-2,6-dioxo-4-trifluoromethyl-(2H)-pyrimidin-1-yl]benzenesulfonylisocyanate

Participants

Reaction Conditions

Reaction Steps

At 60° C., 7.4 g (62.3 mmol) of thionyl chloride were added dropwise with stirring to a suspension of 10.0 g (24.9 mmol) of 2-chloro-4-fluoro-5-[3,6-dihydro-3-methyl-2,6-dioxo-4-trifluoromethyl-(2H)-pyrimidin-1-yl]-benzenesulfonylamide in 1,2-dichloroethane. The mixture was then boiled under reflux for 4 h. The mixture was then cooled to 60° C., a catalytic amount of pyridine was added and phosgene was introduced under reflux for 12 h until a clear solution was obtained. After cooling to 30° C., the product was freed from the solvent. This gave 11.6 g (98% of theory) of the title compound.

Provenance & Evidence