Phosgene → HCID 23630276, compound

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Reaction Steps

Phosgene (20% in toluene, 0.54 mL, 1.0 mmol, 2.0 equiv) is added to a solution of 2,4-dichloro-5-methoxy-3-trifluoromethylaniline (156 mg, 0.60 mmol, 1.2 equiv) in dioxane (2 mL), under a nitrogen atmosphere. The mixture is heated to reflux, stirred for 75 min, allowed to cool to RT, and concentrated in vacuo. The resulting solid 2,4-dichloro-5-methoxy-3-trifluoromethyl-phenylisocyanate is added portion-wise to a boiling solution of N-[4-(4-ethyl-piperazin-1-yl)-phenyl]-N′-methyl-pyrimidine-4,6-diamine (156 mg, 0.50 mmol; preparation see Step 25.5) in 6 ml of toluene under a nitrogen atmosphere. The reaction mixture is stirred at 110° C. for 3.3 h, allowed to cool to RT, and diluted with DCM and a saturated aqueous solution of NaHCO3. The aqueous layer is separated off and extracted twice with DCM. The organic phase is washed with brine, dried (Na2SO4), filtered and concentrated. Trituration of the resulting solid with 2 portions of MeOH yields the title compound: ESI-MS: 598/600 [MH]+; tR=5.1 min (purity: 97%, system 1).

Provenance & Evidence