Benzo(B)Thiophene → Benzothiophene 1,1-dioxide

To a solution (120 mL) of 1-benzothiophene (11.2 g) in tetrahydrofuran was added m-chloroperbenzoic acid (70% containing, 43.1 g) at 0° C. and the mixture was stirred at the same temperature for 1 hr, further stirred at room temperature for 1 hr. An aqueous sodium thiosulfate solution (50 mL) was added to the reaction mixture, and the mixture was extracted with ethyl acetate. The extract was washed with 1 mol/L aqueous sodium hydroxide solution, saturated aqueous sodium hydrogencarbonate solution, water and saturated brine, dried over anhydrous magnesium sulfate, and concentrated under reduced pressure. The residue was recrystallized from ethyl acetate to give the title compound as a white solid (yield 10.3 g, 74%).

1. stirringfurther stirred at room temperature for 1 hr
2. extractionthe mixture was extracted with ethyl acetate
3. washThe extract was washed with 1 mol/L aqueous sodium hydroxide solution, saturated aqueous sodium hydrogencarbonate solution, water and saturated brine
4. dry with materialdried over anhydrous magnesium sulfate
5. concentrationconcentrated under reduced pressure
6. customThe residue was recrystallized from ethyl acetate

ORD-Eintrag

ord-db8730c61b4b4fd5ad163a8fece09495

Quelldatensatz

uspto-grants-2011_11

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US08048909B2