Methyl iodide → (RS)-6-[2-(2-Chloro-4-methoxy-phenyl)-propionyl]-4-methyl-4H-benzo[1,4]oxazin-3-one

To a solution of 6-[2-(2-chloro-4-methoxy-phenyl)-acetyl]-4-methyl-4H-benzo[1,4]oxazin-3-one (5.9 g, 17 mmol) in tetrahydrofuran (380 ml) was added sodium hydride (60% dispersion in mineral oil, 0.72 g, 17.9 mmol). The mixture was stirred at room temperature for 1.5 h and then placed in an ice bath. A solution of methyl iodide (2.54 g, 17.9 mmol) in tetrahydrofuran (15 ml) was added dropwise (5 min). The ice bath was removed and the mixture was stirred at 35° C. for 3.5 h. The reaction mixture was poured on ice-water and extracted twice with AcOEt. The organic phases were washed with water and brine, dried (MgSO4), filtered and concentrated. The product was purified by column chromatography (SiO2, heptane/EtOAc 2:1) to give the title compound (3.3 g) as a light yellow foam. MS (m/e)=360.2 [M+H+].

1. customplaced in an ice bath
2. customThe ice bath was removed
3. stirringthe mixture was stirred at 35° C. for 3.5 h
4. additionThe reaction mixture was poured on ice-water
5. extractionextracted twice with AcOEt
6. washThe organic phases were washed with water and brine
7. dry with materialdried (MgSO4)
8. filtrationfiltered
9. concentrationconcentrated
10. customThe product was purified by column chromatography (SiO2, heptane/EtOAc 2:1)

ORD-Eintrag

ord-87a7e82a338c4c4799c9bb03c0f9ce40

Quelldatensatz

uspto-grants-2013_05

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US08450313B2