Water → 3-tert-Butyl-7-(2,5-difluorophenyl)-2-(2-ethyl-2H-[1,2,4]triazol-3-ylmethoxy)-4-methylpyrazolo[1,5-d][1,2,4]triazine

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Reaction Steps

To toluene-4-sulfonic acid 3-tert-butyl-7-(2,5-difluorophenyl)-4-methylpyrazolo[1,5-d][1,2,4]triazin-2-yl ester (0.3 g, 0.636 mmol) and (2-ethyl-2H-[1,2,4]triazol-3-yl)methanol (97.3 mg, 1.2 molar eq; prepared as described in EP-A-170073) in DMF (10 ml) was added sodium hydride (30 mg of a 60% dispersion in mineral oil; 1.2 molar eq) and the mixture was stirred at room temperature for 1 h. Water (150 ml) was added then the solution was extracted with diethyl ether (4×50 ml). The combined ether layers were washed with brine (1×100 ml), dried (Na2SO4), the solvent was removed in vacuo and the residue was purified by flash chromatography on silica gel eluting with 0 to 50% ethyl acetate in dichloromethane. 3-tert-Butyl-7-(2,5-difluorophenyl)-2-(2-ethyl-2H-[1,2,4]triazol-3-ylmethoxy)-4-methylpyrazolo[1,5-d][1,2,4]triazine was isolated as a gum, which solidified upon trituration under diethyl ether/isohexane (10 mg, mp=109° C.). 1H NMR (360 MHz, CDCl3) δ 1.40 (3H, t, J=7.3 Hz), 1.55 (9H, s), 3.08 (3H, s), 4.14 (2H, q, J=7.3 Hz), 5.48 (2H, s), 7.18-7.41 (3H, m), 7.88 (1H, s); MS (ES+) m/e 428 [MH]+.

Provenance & Evidence