Iodoethane → 2H-1,4-Benzoxazin-3(4H)-one, 4-ethyl-

Temperatur

0 °C

To a cooled solution of 2H-1,4-benzoxazin-3(4H)-one (11.93 g, 80 mmol) in N,N-dimethylformamide (120 ml) was added sodium hydride (60% dispersion in mineral oil, 3.2 g, 80 mmol) in portions between 0° C. and 5° C. (1 h). The mixture was stirred 1 h at 0° C. To the cooled mixture was added ethyl iodide (13.7 g, 88 mmol) dropwise. The ice bath was removed and the mixture was stirred at r.t. for 17 h. The mixture was poured on water and extracted twice with AcOEt. The organic layers were washed with brine and water, dried (MgSO4) and concentrated. The crude product was purified by column chromatography (silica gel, heptane/AcOEt 9:1) to give the title compound (13.3 g) as colorless oil.

1. customThe ice bath was removed
2. stirringthe mixture was stirred at r.t. for 17 h
3. additionThe mixture was poured on water
4. extractionextracted twice with AcOEt
5. washThe organic layers were washed with brine and water
6. dry with materialdried (MgSO4)
7. concentrationconcentrated
8. customThe crude product was purified by column chromatography (silica gel, heptane/AcOEt 9:1)

ORD-Eintrag

ord-9a6bb6a16b1546f2ab15f3e2ca2e364a

Quelldatensatz

uspto-grants-2012_09

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US08268820B2