Phosphorus oxychloride → HCID 68352551, compound

Participants

Reaction Steps

To solution of tert-butyl 4-(6-cyanopyridin-3-yl)-4-hydroxypiperidine-1-carboxylate (compound 51.2, 600 mg, 1.98 mmol, 1.00 equiv) in pyridine (15 mL) under nitrogen at 10-15° C. was carefully added POCl3 (3 g, 19.74 mmol, 9.97 equiv). After stirring overnight under nitrogen in a water/ice bath, the mixture was concentrated and the residue was dissolved in 50 mL of ethyl acetate. The organic phase was washed with 1×50 mL of hydrogen chloride (aq. 1M) followed by 1×50 mL of sodium bicarbonate (aq.sat.). The organic layer was then dried over anhydrous sodium sulfate and concentrated under reduced pressure. The residue was purified using silica gel column chromatography with ethyl acetate/petroleum ether (1:10) as the eluent to yield 0.26 g (46%) of the title compound as a white solid.

Provenance & Evidence