Chloroiodomethane → (S)-2-chloro-1-(2,2-dimethyl-1,3-dioxolane-4-yl)ethanone

関与物質

反応条件

反応手順

To a solution of (S)-methyl 2,2-dimethyl-1,3-dioxolane-4-carboxylate (1.3 g, 8.1 mmol) and chloroiodomethane (4.3 g, 24 mmol) in THF (50 mL) at −78° C. was added a solution of LDA (16.2 mL, 24 mmol) in portions over 10 minutes. The reaction was stirred at −78° C. for 10 minutes. To this mixture was added a 10% solution of acetic acid (50 mL) in THF at −78° C. After addition, the slurry was warmed to ambient temperature. The reaction was poured into EtOAc (200 mL) and the aqueous layer basified using 1 N NaOH. The organics were separated and washed with brine, dried over MgSO4 and concentrated in vacuo. The material was purified by chromatography using DCM as eluent to give (S)-2-chloro-1-(2,2-dimethyl-1,3-dioxolane-4-yl)ethanone (0.60 g, 3.4 mmol, 42% yield) as an oil.

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