Phosgene → Isopropyl3-(2-chloro-4-fluoro-5-isocyanatophenyl)tetrahydro-5-methyl-2,4,6-trioxo-s-triazine-1(2H)-acetate

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A mixture of isopropyl 3-(5-amino-2-chloro-4-fluorophenyl)tetrahydro-5-methyl-2,4,6-trioxo-s-triazine-1(2H)-acetate (4.0 g, 0.0103 mol) in toluene is treated with a 1.93M solution of phosgene in toluene (19 mL), refluxed for 3 hours, cooled, partially concentrated in vacuo, diluted with toluene, partially concentrated in vacuo, diluted with toluene and concentrated in vacuo to give the title product as a yellow foam which is identified by 1H NMR spectral analysis.

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