Water → HCID 66876063, compound

Participants

Reaction Steps

[3-(4-Methyl-pyridin-2-yloxy)-benzyl]-phosphonic acid diethyl ester (2.9 g, 8.6 mmol) from Step 3 and 1,4,7,10,13-pentaoxacyclopentadecane (15-Crown-5, 0.03 mL, 0.17 mmol) were combined in THF (10 mL). Sodium hydride (381 mg, 60% dispersion in mineral oil, 9.51 mmol) was added. The reaction was stirred for 30 minutes and then a solution of 4-oxo-piperidine-1-carboxylic acid tert-butyl ester (1.90 g, 9.51 mmol) in THF (10 mL) was added. After 16 hours, water was added and the layers were separated. The aqueous layer was extracted with EtOAc (2×200 mL) and the combined organic layer was dried over anhydrous sodium sulfate, filtered and concentrated. The residue was purified by silica gel chromatography (10-30%, EtOAc:heptane) to afford the desired product (1.15 g, 35% yield) as a thick oil.

Provenance & Evidence