4-Acetyl-piperidine-1-carboxylic acid tert-butyl ester → tert-Butyl 4-(1-hydroxy-1-methyl-3-phenylprop-2-ynyl)piperidine-1-carboxylate

Participants

Reaction Conditions

Reaction Steps

Into a solution of 4-acetylpiperidine-1-carboxylic acid tert-butyl ester (0.67 g, 2.95 mmol), prepared as described in WO2004041777, in THF (20 mL) cooled at −10° C. was dropped a 1M solution of phenylethynylmagnesium bromide in THF (4.5 mL, 4.5 mmol). The reaction mixture was stirred at room temperature overnight. Afterwards, it was quenched with a saturated aq. solution of ammonium chloride and extracted with EtOAc. The combined organic layers were washed with brine, dried on Na2SO4 and evaporated to dryness in vacuo to afford a residue, which was purified by automated flash liquid chromatography (Horizon™-Biotage) eluting with Petroleum Ether-EtOAc 7:3, affording the title product as a pale yellow oil.

Provenance & Evidence