Potassium Iodide → 1-(2,4-Dimethoxybenzyl)-4-[(4-iodo-1H-pyrazol-1-yl)methyl]-4-methylpyrrolidin-2-one

Participants

Reaction Conditions

Reaction Steps

A mixture of 4-iodo-1H-pyrazole (270 mg, 1.4 mmol), [1-(2,4-dimethoxybenzyl)-3-methyl-5-oxopyrrolidin-3-yl]methyl methanesulfonate (500 mg, 1.4 mmol), cesium carbonate (910 mg, 2.8 mmol), and potassium iodide (10 mg, 0.05 mmol) in DMF (80 mL) was stirred at 80° C. for 12 hours. The mixture was diluted with water and extracted with ethyl acetate. The organic layer was dried over sodium sulfate, filtered, and concentrated under reduced pressure. The residue was purified by chromatography on silica gel (ethyl acetate/petroleum ether) to give 1-(2,4-Dimethoxybenzyl)-4-[(4-iodo-1H-pyrazol-1-yl)methyl]-4-methylpyrrolidin-2-one. MS ESI calc'd. for C18H231 N3O3 [M+H]+ 456. found 456. 1H NMR (400 MHz, MeOD): δ 7.49 (s, 1H), 7.44 (s, 1H), 7.05 (d, J=8 Hz, 1H), 6.54 (d, J=2.4 Hz, 1H), 6.49-6.47 (m, 1H), 4.30 (d, J=4 Hz, 2H), 4.06 (d, J=2 Hz, 2H), 3.78 (s, 6H), 3.33-3.29 (m, 1H), 2.91 (d, J=6.4 Hz, 1H), 2.54 (d, J=16.8 Hz, 1H), 2.17 (d, J=16.8 Hz, 1H), 1.01 (s, 3H).

Provenance & Evidence