Potassium Carbonate → pyridinylpiperazine ethyl-1H-isoindole-1,3(2H)-dione

Participants

Reaction Steps

To a solution of bromoethyl phthalimide 1 (5 mmol) and 2-pyridyl piperazine 2 (5 mmol) in acetonitrile (10 mL) was added potassium carbonate (0.690 g, 5 mmol) and resulting reaction mixture was stirred under reflux. After completion of the reaction, solvent was removed on rotavap and residue was dissolved in chloroform (20 mL). Then washed with water (5 mL) and saturated sodium bicarbonate solution (5 mL), dried over anhydrous sodium sulfate. Filtered and evaporation of solvent gave pyridinylpiperazine ethyl-1H-isoindole-1,3(2H)-dione. Then dissolved in methanol (10 mL), hydrazine hydrate (0.48 mL, 15 mmol) was added and stirred under reflux to give a precipitate. Filtered, washed with methanol (5 mL) and evaporation of solvent gave 2-(4-pyridin-2-ylpiperazin-1-yl)ethanamine 3 which was used as such in the next step.

Provenance & Evidence