Tetrahydrofuran → methyl 3-[(4-bromo-1H-pyrazol-1-yl)methyl]benzoate

Participants

Reaction Steps

To a solution of 4-bromo-1H-pyrazole (1.00 g, 6.80 mmol) in DMF (11.7 mL) at 0° C. was added 1 M solution of NaHMDS in THF (7.48 mL, 7.48 mmol) slowly over 2 min. The reaction mixture was stirred for 10 min and then the cooling bath was removed. After 30 min a solution of methyl 3-(bromomethyl)benzoate (1.71 g, 7.48 mmol) in DMF (1.9 mL) was added slowly, and the resulting mixture was stirred at room temperature overnight. At the conclusion of this period, the reaction mixture was quenched with saturated aq ammonium chloride (˜1 mL), and partitioned between diethyl ether and water. The resulting mixture was stirred vigorously for 15 min. After this time, the organic layer was separated, dried over anhydrous Na2SO4, filtered, and concentrated. The resulting residue was purified by flash chromatography (0-60% ethyl acetate:hexanes) to afford the title compound (1.59 g, 79%). LCMS, [M+H]+=295.0. 1H NMR (400 MHz, CDCl3) δ 8.00 (d, J=7.1 Hz, 1H), 7.94 (s, 1H), 7.50 (s, 1H), 7.47-7.36 (m, 3H), 5.31 (s, 2H), 3.92 (s, 3H).

Provenance & Evidence