Oxalyl chloride → N-(6-acetyl-2-chloro-3-methoxyphenyl)-2-(trifluoromethyl)thiazole-4-carboxamide

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Reaction Conditions

Reaction Steps

Oxalyl chloride (1.9 mL, 1.4 eq.) was added dropwise under nitrogen at 0° C. to a suspension of compound 252 (4 g, 1.2 eq.) in DCM (120 mL) and DMF (few drops). The reaction mixture was stirred at 0° C. for 30 min and then at room temperature for additional 3 hrs. The solid was removed by filtration under nitrogen and the filtrate was evaporated to give a yellow oil. This oil was solubilised in dioxane (30 mL) and added under nitrogen to a solution of 6-acetyl-2-chloro-3-methoxy aniline 201d (3.26 g, 1 eq.) in 1,4-dioxane (60 mL). The reaction mixture was stirred at room temperature for 3 days. The solvent was removed under reduced pressure, the residue was solubilised in dichloromethane, washed with water, dried over Na2SO4 and concentrated in vacuum. The crude oil was triturated in MeOH/Et2O mixture to give the compound 254a as a white solid in 69% yield. 1H NMR (CDCl3, 400 MHz): δ (ppm) 2.59 (s, 3H), 4 (s, 3H), 6.90 (d, J=8.75 Hz, 1H), 7.70 (d, J=8.75 Hz, 1H), 8.44 (s, 1H), 10.28 (s, 1H); 19F NMR (CDCl3, 376 MHz): δ (ppm) −61.08 (s, 3F).

Provenance & Evidence