HCID 59568648, compound → HCID 59568649, compound

Participants

Reaction Steps

The slower eluting isomer of tert-Butyl 4-[2-(5-cyano-4-methoxy-2-pyridyl)-2-hydroxy-ethyl]piperazine-1-carboxylate (1.0 g, 2.76 mmol) was dissolved in 5 mL of TFA and stirred at room temperature for 2 hours. The mixture was concentrated to ¼ the original volume and diluted with 10 mL of diethyl ether. The precipitate was filtered and dried under high vacuum to offer amine TFA salt. This intermediate was diluted with 5% aqueous sodium bicarbonate with follow up addition of 10 N NaOH to bring the pH of extraction above 10. The aqueous layer was extracted with ethyl acetate. The organic layers were dried over MgSO4, filtered, and concentrated under reduced pressure to provide the product (Isomer B).

Provenance & Evidence