Cesium carbonate → 1-[4-(4-Methoxy-3-nitro-phenyl)-piperazin-1-yl]ethanone

Participants

Reaction Conditions

Reaction Steps

To a solution of 5-bromo-1-methoxy-2-nitrobenzene (300 mg, 1.29 mmol) in dioxane, 1-acetyl piperazine (400 mg, 3.12 mmol), cesium carbonate (1.0 g, 3.07 mmol), palladium diacetate (29.0 mg, 0.129 mmol) and 2-(di-t-butylphosphino)biphenyl (77 mg, 0.258 mmol) are added and stirred at 100° C. for 8 hours. After cooling, the mixture is filtered to remove insoluble material. The filtrate is poured into water and extracted with ethyl acetate twice. The organic layer is washed with water and then brine, dried over magnesium sulfate, and evaporated in vacuo. The residue is purified by silica gel column chromatography (n-hexane:ethyl acetate gradient) to afford 1-[4-(4-Methoxy-3-nitro-phenyl)-piperazin-1-yl]-ethanone (319 mg, 44%) as yellow solids.

Provenance & Evidence