Diethyl Ether → 2-(4-Fluorophenyl)-3-[2-(1-pyrrolidinyl)-4-pyrimidinyl]-6-(trifluoromethyl)pyrazolo[1,5-a]pyridine

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Reaction Steps

To a solution of (2E)-3-(dimethylamino)-1-[2-(4-fluorophenyl)-6-(trifluoromethyl)pyrazolo[1,5-a]pyridin-3-yl]-2-propen-1-one (100 mg, 0.27 mmol) in 1-methyl-2-pyrrolidinone (3 mL) was added 1-pyrrolidinecarboximidamide sulfate (111 mg, 0.53 mmol), and potassium carbonate (73 mg, 0.53 mmol). The mixture was heated at reflux for 8 hours. Upon cooling to room temperature, ether was added followed by water. The organics were washed with brine, and the aqueous layer was extracted with ether. The combined organics were dried over magnesium sulfate, filtered and concentrated in vacuo. The residue was purified by flash chromatography on silica (6:1 hexanes-ethyl acetate) to give 2-(4-fluorophenyl)-3-[2-(1-pyrrolidinyl)-4-pyrimidinyl]-6-(trifluoromethyl)pyrazolo[1,5-a]pyridine (80 mg, 71%) as a foam. 1H NMR (CDCl3): δ 8.86 (s, 1 H), 8.61 (d, 1 H), 8.19 (m, 1 H), 7.67 (m, 2 H), 7.46 (d, 1 H), 7.19 (m, 2 H), 6.31 (m, 1 H), 3.70 (m, 4 H), 2.08 (m, 4 H); 19F NMR (CDCl3) δ −62.68, −112.27.

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