Pyridine → 2-(1-(4-fluorobenzyl)-5-oxo-1H-1,2,4-triazol-4(5H)-yl)-4-methylthiazole-5-carbonitrile

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Reaction Steps

A mixture of 2-(1-(4-fluorobenzyl)-5-oxo-1H-1,2,4-triazol-4(5H)-yl)-4-methylthiazole-5-carboxamide (0.45 g, 1.35 mmol), pyridine (0.21 g, 2.71 mmol) and trifluoroacetic anhydride (0.57 g, 2.71 mmol) in dioxane (12.0 mL) was heated at reflux for 16 h and concentrated in vacuo to dryness. The residue was purified by flash column chromatography eluted with ethyl acetate in hexane (20%) to afford 2-(1-(4-fluorobenzyl)-5-oxo-1H-1,2,4-triazol-4(5H)-yl)-4-methylthiazole-5-carbonitrile as a colourless solid (0.26 g, 63%): mp 190-192° C.; 1H NMR (300 MHz, DMSO-d6) δ 8.80 (s, 1H), 7.38-7.33 (m, 2H), 7.18-7.12 (m, 2H), 4.97 (s, 2H), 2.49 (s, 3H); 13C NMR (75 MHz, DMSO-d6) δ 162.2 (d), 161.3, 156.0, 150.3, 132.5, 132.4, 130.5 (d), 115.9 (d), 113.3, 97.5, 48.3, 17.2; MS (ES+) m/z 316.9 (M+1).

Provenance & Evidence