Ammonium Chloride → Tert-butyl 3-benzoylpyrrolidine-1-carboxylate

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反応手順

A stirred solution of tert-butyl 3-(methoxy(methyl)carbamoyl)pyrrolidine-1-carboxylate (2.27 g, 8.8 mmol) in dry THF (40 mL) was cooled in an ice bath and 1 M PhMgBr in THF (20 mL, 20.0 mmol) was added dropwise over 2 min. The mixture was stirred and the ice bath was allowed to melt. After 3 h, the mixture was poured into satd aq NH4Cl and extracted with ether (2×200 mL). The combined ether extracts were dried over MgSO4 and concentrated to leave an oil. Flash chromatography on a 40-g silica cartridge eluted with a 0 to 50% EtOAc in hexanes gradient afforded tert-butyl 3-benzoylpyrrolidine-1-carboxylate (2.04 g, 84%) as a clear colorless oil.

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