Reaktion #40764

Reaktionsgleichung

NaHCO3

Acetic anhydride

3-Hydroxymethyl-pentan-2-one

MeOH

→

light-yellow liquid

Acetic acid 2-ethyl-3-oxo-butyl ester

Lösungsmittel

CHCl3

Reaktionsbedingungen

Aufarbeitung

1. 1
   Temperaturcooled in an ice bath
2. 2
   TemperaturAfter cooling in an ice bath
3. 3
   ExtraktionAfter extraction with DCM twice
4. 4
   Trocknenthe combined organic phases were dried over Na2SO4
5. 5
   Sonstigeevaporated under reduced pressure

Vorschrift

3-Hydroxymethyl-pentan-2-one (20.7 g) was dissolved in CHCl3 (150 mL) and cooled in an ice bath. Acetic anhydride (80 mL) was added, followed by DMAP (2.18 g), and the mixture was stirred overnight at room temperature. After cooling in an ice bath, MeOH (120 mL) was added dropwise, and the mixture was poured into a saturated aqueous NaHCO3 solution. After extraction with DCM twice, the combined organic phases were dried over Na2SO4 and evaporated under reduced pressure to give 28.0 g of a light-yellow liquid. 1H NMR (400 MHz, CDCl3) δ 0.93 (t, J=8 Hz, 3H), 1.46-1.75 (m, 2H), 2.03 (s, 3H), 2.20 (s, 3H), 2.77 (quint., J=6.5 Hz, 1H), 4.20 (d, J=7 Hz, 3H).

Quelle