Reaktion #46954

Reaktionsgleichung

phosgene

thionyl chloride

2-chloro-4-fluoro-5-[3,6-dihydro-3-methyl-2,6-dioxo-4-trifluoromethyl-(2H)-pyrimidin-1-yl]-benzenesulfonylamide

pyridine

→

title compound

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

Lösungsmittel

1,2-dichloroethane

Reaktionsbedingungen

Aufarbeitung

1. 1
   Temperaturunder reflux for 4 h
2. 2
   Temperaturunder reflux for 12 h until a clear solution
3. 3
   Sonstigewas obtained
4. 4
   TemperaturAfter cooling to 30° C.

Vorschrift

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.

Quelle