m-Chloroperbenzoic acid → tetrahydro-2-(oxiranylethoxy)-2H-pyran

Temperatur

0 °C

Into a 500-mL flask containing 2-(3-butenyloxy)tetrahydropyran (49.0 g, 0.314 mol) in CH2Cl2 (500 mL) under a nitrogen atmosphere and cooled to 0° C. was added freshly crystallized m-chloroperoxybenzoic acid (95 g, 0.55 mol). The mixture was maintained at 0° C. for a period of 24 h. The precipitated benzoic acid was removed via vacuum filtration. The filtrate thus obtained was washed successively with 10% aqueous sodium hydroxide (500 mL) and saturated aqueous sodium sulfite (500 mL), respectively, the organic layer dried over anhydrous MgSO4 and concentrated in vacuo to afford tetrahydro-2-(oxiranylethoxy)-2H-pyran as a pure clear colorless liquid (52 g, 95%), which was used without any further purification: 1H NMR (CDCl3, 300 MHz) δ 4.62 (s, 1H], 3.86-3.92 [m, 2H], 3.52-3.55 [m, 2H], 3.08 [br, 1H], 2.78-2.81 [t, J=3 Hz, 1H], 2.53-2.55 [t, J=3 Hz, 1H], 1.53-1.88 [m, 8H].

1. temperatureThe mixture was maintained at 0° C. for a period of 24 h
2. customThe precipitated benzoic acid was removed via vacuum filtration
3. customThe filtrate thus obtained
4. washwas washed successively with 10% aqueous sodium hydroxide (500 mL) and saturated aqueous sodium sulfite (500 mL)
5. dry with materialrespectively, the organic layer dried over anhydrous MgSO4
6. concentrationconcentrated in vacuo

ORD-Eintrag

ord-b716c2bd8b7c40a8a5eab6fbfbc1c962

Quelldatensatz

uspto-grants-2009_01

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US07476679B2