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 1N 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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