Phosphorus oxychloride → HCID 68352494, compound

Participants

Reaction Steps

To a stirred mixture of tert-butyl 4-(5-cyanopyridin-2-yl)-4-hydroxypiperidine-1-carboxylate (compound 26.2, 500 mg, 1.65 mmol, 1.00 equiv) in pyridine (20 mL) was added dropwise phosphoryl trichloride (2.5 g, 16.34 mmol, 9.90 equiv) at 10-15° C. The resulting solution was stirred for 18 h at 15˜20° C. The reaction was then carefully quenched by the addition of 20 mL of water and extracted with 3×100 mL of ethyl acetate. The combined organic phases were washed with 2×50 mL of aqueous HCl (1 M) followed by 1×100 mL of brine. The organic layer was dried over anhydrous sodium sulfate and concentrated under reduced pressure. The residue was purified using silica gel column chromatography with ethyl acetate/petroleum ether (1:100 to 1:7) as eluent to yield 0.3 g (64%) of the title compound as a yellow solid.

Provenance & Evidence