Dimethylformamide → 6-(4-(trifluoromethoxy)phenyl)-2-(2-(5-(trifluoromethyl)pyrimidin-2-yloxy)ethyl)-[1,2,4]triazolo[4,3-a]pyridin-3(2H)-one

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Reaction Steps

6-(4-(trifluoromethoxy)phenyl)-[1,2,4]triazolo[4,3-a]pyridin-3(2H)-one (825 mg) from Example 1 above was dissolved in DMA (10 mL), 2-bromoethanol (1.0 g) and potassium carbonate (235 mg) were added. Heated overnight at 110° C. Filtered, concentrated, and purified by chromatography (ethyl acetate/hexanes). 2-(2-hydroxyethyl)-6-(4-(trifluoromethoxy)phenyl)-[1,2,4]triazolo[4,3-a]pyridin-3(2H)-one was obtained as white solid (830 mg). m/z (ESI)=340.0 (base peak, M+H+); 701.1 (2M+Na+). 2-(2-hydroxyethyl)-6-(4-(trifluoromethoxy)phenyl)-[1,2,4]triazolo[4,3-a]pyridin-3(2H)-one (50 mg) was dissolved in dry DMF and the NaH suspension (12 mg, 60% in oil) was added, followed shortly by 2-chloro-5-trifluoromethylpyridine (54 mg). Concentrated and purified on silica using ethyl acetate/hexanes gradient to obtain compound 180 as a white solid (71 mg). m/z (ESI)=486.1 (base peak, M+H+); 508.1 (M+Na+); 993.2 (2M+Na+). 1H NMR (δ, CDCl3, 400 MHz) 8.75 (s, 2H); 7.98 (d, 1H); 7.53 (d, 2H); 7.40-7.30 (m, 3H); 7.18 (d, 1H); 4.90 (t, 2H); 4.49 (t, 2H). 19F NMR (δ, CDCl3, 376 MHz) −58.36 (s, 1F); −61.99 (s, 1F).

Provenance & Evidence