Ethyl 2-hydroxyisobutyrate → 2-Ethoxy-5-(methanesulfonyl)pyridine

Temperatur

80 °C

A mixture of ethyl 2-hydroxyisobutyrate (0.41 mL, 3.0 mmol), 2,5-bis(methyl sulfonyl)pyridine (J. Heterocycl. Chem. 1985, 22, 1583) (0.70 g, 3.0 mmol) and sodium hydride (60% dispersion in mineral oil, 0.14 g, 3.6 mmol) in 30 mL of anhydrous DMF was heated at 80° C. overnight. The reaction mixture was cooled to room temperature, and was partitioned between saturated aqueous ammonium chloride (200 mL) and ether (200 mL). The organic layer was separated and was washed with water and brine, dried over anhydrous sodium sulfate, filtered and concentrated to dryness, and the residue was purified by flash column chromatography on silica gel eluting with 0 to 80% ethyl acetate in hexane to give the title compound as a 1:1 mixture with 2-ethoxy-5-methylsulfonylpyridine. LC-MS: m/e 288 (M+H)+ (0.70 min).

1. temperatureThe reaction mixture was cooled to room temperature
2. customwas partitioned between saturated aqueous ammonium chloride (200 mL) and ether (200 mL)
3. customThe organic layer was separated
4. washwas washed with water and brine
5. dry with materialdried over anhydrous sodium sulfate
6. filtrationfiltered
7. concentrationconcentrated to dryness
8. customthe residue was purified by flash column chromatography on silica gel eluting with 0 to 80% ethyl acetate in hexane

ORD-Eintrag

ord-28fc9b0b84de40b2b14864399898537d

Quelldatensatz

uspto-grants-2010_10

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US07816534B2