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0 °C

A mixture of 3-(5-amino-4-chloro-2-fluorophenyl)-1-methyl-6-(trifluoromethyl)-2,4 (1H,3H)-pyrimidinedione (1.0 g, 2.96 mmol) in toluene is cooled to 0° C., treated sequentially with triethylamine (0.91 mL, 6.52 mmol) and thiophosgene (0.25 mL, 3.26 mmol), warmed to and stirred at room temperature for 5 hours, and filtered to remove solids. The resultant filtrate is concentrated in vacuo to give the title product as an orange solid (1.1 g, 98% yield) which is identified by 1H NMR spectral analysis.

1. temperaturewarmed to and
2. filtrationfiltered
3. customto remove solids
4. concentrationThe resultant filtrate is concentrated in vacuo