Hydrochloric Acid → 1-{2-[3-(5-(1H-1,2,4-Triazol-5-YL)-1H-indazol-3-YL)phenoxy]ethyl}pyrrolidin-2-one

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Reaction Steps

Triphenylphosphine (0.694 g, 2.65 mmol), tetrahydrofuran (2.12 mL), 1-(2-hydroxyethyl)pyrrolidin-2-one (0.299 mL, 2.65 mmol) and diethylazodicarboxylate (0.418 mL, 2.65 mmol) were added to 3-{1-perhydro-2H-pyran-2-yl-5-[1-(triphenylmethyl)(1,2,4-triazol-3-yl)]-1H-indazol-3-yl}phenol (0.400 g, 0.662 mmol). The mixture was stirred at ambient temperature for 23 h and poured into aqueous 6N hydrochloric acid (25 mL). After stirring at ambient temperature for 4 h, the mixture was extracted with ether (3×). The aqueous fraction was added to aqueous 6N sodium hydroxide (25 mL) and the pH adjusted to 11. The solution was extracted with ethyl acetate (3×) and the organic fractions were combined and dried over anhydrous sodium sulfate, filtered and evaporated. The residue was purified by flash chromatography on silica pretreated with 2% triethylamine/ethyl acetate followed by 0–15% methanol/ethyl acetate. The desired fractions were concentrated, dissolved in ethyl acetate, washed with aqueous sodium bicarbonate, dried over anhydrous sodium sulfate, filtered and evaporated to give the title compound (0.0768 g, 30% yield). 1H NMR (CD3OD) δ 13.41 (br s, 1H), 8.65 (s, 1H), 8.10 (d, 1H), 7.70 (d, 1H), 7.60 (d, 1H), 7.50 (m, 2H), 7.05 (m, 1H), 4.20 (t, 2H), 3.60 (t, 2H), 3.50 (t, 2H), 2.25 (t, 2H), 1.95 (m, 2H). ES-MS (m/z) 389 [M+1]+.

Provenance & Evidence