(3R)-1-(tert-butoxycarbonyl)-3-(2-phenoxybenzoyl)piperidine → (R)-tert-butyl 3-((S)-1-hydroxy-5-methoxy-1-(2-phenoxyphenyl)pentyl)piperidine-1-carboxylate

Participants

Reaction Steps

To a solution of (3R)-1-(tert-butoxycarbonyl)-3-(2-phenoxybenzoyl)piperidine (6.17 g, 16.2 mmol) in THF (30 mL) at −10° C. was added dropwise 2.54 M 4-methoxybutylmagnesium chloride in THF (15 mL, 38 mmol). The resulting solution was warmed to rt slowly, and stirred over night. The reaction was quenched with satd NH4Cl (10 mL) and extracted with Et2O (4×10 mL). The combined organic layers were washed with water and brine. The solvent was removed and the residue was purified by flash chromatography to give (R)-tert-butyl 3-((S)-1-hydroxy-5-methoxy-1-(2-phenoxyphenyl)pentyl)piperidine-1-carboxylate (1.97 g, 26% from (R)-tert-butyl 3-(N-methoxy-N-methylcarbamoyl)piperidine-1-carboxylate).

Provenance & Evidence