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温度

0 °C

tert-Butyl 4-oxopiperidine-1-carboxylate (2.363 g, 11.86 mmol) was dissolved in toluene (7 mL) and cooled to 0° C. LHMDS (12.45 mL, 12.45 mmol) in THF was added. After 2 min 2-phenylpropanoyl chloride (0.855 mL, 5.93 mmol) was added. After 2 min the cooling bath was removed and after 5 min 1:1 acetic acid:water (3 ml) was added. The water phase was separated after hard stirring and the organic phase was dried with MgSO4 and the solvent was evaporated. Purification by flash column chromatography (0-25% EtOAc in heptane) yielded tert-butyl 4-oxo-3-(2-phenylpropanoyl)piperidine-1-carboxylate (1.319 g, 67.1%). MS (ES−) m/z 330.1 (M−H)−

1. customAfter 2 min the cooling bath was removed and after 5 min 1:1 acetic acid
2. additionwater (3 ml) was added
3. customThe water phase was separated
4. dry with materialthe organic phase was dried with MgSO4
5. customthe solvent was evaporated
6. customPurification by flash column chromatography (0-25% EtOAc in heptane)