N-(2-Oxo-3-piperidyl)phthalimide → (+/-)2-(2-methoxy-3,4,5,6-tetrahydropyridin-3-yl)-1H-isoindole-1,3(2H)-dione

Participants

Reaction Steps

To a solution of 13.474 g (91.1 mmol) of trimethyloxonium tetrafluoroborate in 294 mL of anhydrous dichloromethane was added 22.25 g (91.1 mmol) of (+/−)-3-phtalimidopiperidin-2-one (Heterocycles (1996), 42(2), 537-42, Enantiomer (2001), 6(5), 275-279, Synthesis (1991), (5), 417-20) and the resulting mixture was stirred at room temperature for 12 h. The mixture was hydrolyzed with a saturated aqueous solution of sodium hydrogen carbonate, extracted with dichloromethane, dried over sodium sulfate and the solvent was evaporated to afford 23.22 g (99%) of pure product as a yellow oil. The compound was used as such in the next step.

Provenance & Evidence