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

Temperatur

-78 °C

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. 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.

1. additionAfter addition
2. temperaturethe slurry was warmed to ambient temperature
3. customThe organics were separated
4. washwashed with brine
5. dry with materialdried over MgSO4
6. concentrationconcentrated in vacuo
7. customThe material was purified by chromatography

ORD-Eintrag

ord-3420a5cfa3d74fae89e5a04f85a5db03

Quelldatensatz

uspto-grants-2012_07

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US08212045B2