Reacción #10272

Ecuación de reacción

acetophenone oxime

water

4-(2-chloroethyl)morpholine hydrochloride

sodium hydroxide

water

→

acetophenone O-[2-((morpholin-4-yl))ethyl]oxime

Disolventes

toluene

Condiciones de reacción

Tratamiento posterior

1. 1
   workup.ADDITIONwas added
2. 2
   workup.DISSOLUTIONto dissolve all the salts
3. 3
   Otrothe layers were separated
4. 4
   Extracciónthe aqueous layer was extracted with toluene
5. 5
   SecadoThe organic layers were dried (MgSO4)
6. 6
   Concentraciónconcentrated in vacuo
7. 7
   OtroThe residue was purified by flash chromatography (SiO2, CH2Cl2/MeOH 95/5)

Procedimiento

To a solution of acetophenone oxime (20 g) in toluene (700 mL) was added subsequently tetrabutylammonium bromide (4.77 g), water (8 mL), 4-(2-chloroethyl)morpholine hydrochloride (30.31 g) and finally 50% sodium hydroxide (aq, 52 mL). The resulting mixture was heated at 75° C. overnight. After cooling to room temperature water was added, to dissolve all the salts, the layers were separated, and the aqueous layer was extracted with toluene. The organic layers were dried (MgSO4), and concentrated in vacuo. The residue was purified by flash chromatography (SiO2, CH2Cl2/MeOH 95/5) to afford acetophenone O-[2-((morpholin-4-yl))ethyl]oxime as an oil. The obtained oil was dissolved in 6M HCl (aq, 500 mL) and heated under reflux for 5 hours and subsequently stirred overnight at room temperature. The mixture was extracted with ether and concentrated in vacuo. The residue was crystallized from ethanol, to afford O-[2-((morpholin-4-yl))ethyl]hydroxylamine dihydrochloride. 24.8 g (77%)

Fuente