Reaktion #1710746

Reaktionsgleichung

(S)-3-hydroxybutanoic acid methyl ester

1H-imidazole

tert-Butyl(chloro)diphenylsilane

→

(3S)-3-[[(1,1-Dimethylethyl)diphenylsilyl]oxy]-butanoic acid methyl ester

Lösungsmittel

EtOAc

DMF

Reaktionsbedingungen

Aufarbeitung

1. 1
   Temperaturcooled
2. 2
   Sonstigethe cloudy reaction mixture
3. 3
   Waschenwashed successively with H2O (3×), 1N HCl
4. 4
   TrocknenThe organic phase was dried (Na2SO4)
5. 5
   Filtrationfiltered
6. 6
   Einengenconcentrated
7. 7
   Sonstigeto give a viscous colourless oil

Vorschrift

tert-Butyl(chloro)diphenylsilane (15.282 g, 55.6 mmol) was added dropwise to an ice-cooled and stirred solution of (S)-3-hydroxybutanoic acid methyl ester (5.473 g, 46.3 mmol) and 1H-imidazole (6.939 g, 102 mmol) and DMAP (0.566 g, 4.63 mmol) in DMF (250 mL). After 10 min., the cloudy reaction mixture was allowed to warm to r.t. and stirred overnight. The reaction mixture was taken up in EtOAc, then washed successively with H2O (3×), 1N HCl and a sat. NaHCO3 solution. The organic phase was dried (Na2SO4), filtered and concentrated to give a viscous colourless oil.

Quelle