Reaktion #57793

Reaktionsgleichung

N-Methoxy-N-methyl-2-phenyl-isobutyramide

methymagnesium bromide

→

title compound

3-Methyl-3-phenyl-butan-2-one

Lösungsmittel

tetrahydrofuran

heptane

Reaktionsbedingungen

Aufarbeitung

1. 1
   Temperaturto cool to ambient temperature
2. 2
   Sonstigewas quenched with 1M HCl
3. 3
   SonstigeThe resulting mixture was partitioned between water and ether
4. 4
   Sonstigethe phases were separated
5. 5
   WaschenThe ether phase was washed once each with 1M HCl and brine
6. 6
   Trocknendried over Na2SO4
7. 7
   Filtrationfiltered
8. 8
   Einengenconcentrated in vacuo to an oil
9. 9
   SonstigeThe oil was chromatographed

Vorschrift

To 2.1 g (10.1 mmol) of N-Methoxy-N-methyl-2-phenyl-isobutyramide in 80 ml of dry tetrahydrofuran at ambient temperature was added 6.7 ml (20.2 mmol) of 3M methymagnesium bromide in heptane, and the solution was warmed to 60° C. After 6 hours, the mixture was allowed to cool to ambient temperature and was quenched with 1M HCl. The resulting mixture was partitioned between water and ether, and the phases were separated. The ether phase was washed once each with 1M HCl and brine, dried over Na2SO4, filtered, and concentrated in vacuo to an oil. The oil was chromatographed to give the title compound as a clear oil: 1H NMR CDCl3 δ (ppm): 1.49 (s, 6H), 1.93 (s, 3H), 7.24-7.34 (m, 5H).

Quelle