Ozone → (RS)-2-(2-oxoethyl)-6-bromo-1-indanone

An ozone stream (2 g ozone/hour) was conducted for 60 minutes while stirring through a solution, cooled to -70°, of 9.86 g of (RS)-2-(2-buten-1-yl)-6-bromo-1-indanone in 150 ml of anhydrous dichloro-methane and 30 ml of anhydrous methanol. Subsequently, the mixture was flushed with oxygen for 5 minutes and with argon for 10 minutes. After the addition of 4.09 ml of dimethyl sulfide, the mixture was stirred at room temperature for 15 hours. The reaction mixture was evaporated in a vacuum. The residue was treated with 1 50 ml of dichoromethane and, after the addition of 20 ml of water and 20 ml of trifluoroacetic acid, stirred at room temperature for 2 hours. The mixture was subsequently poured into 100 ml of water and neutralized by the spatula-wise addition of sodium hydrogen carbonate while stirring. An additional 50 ml of water were added. The phases were separated and the aqueous phase was extracted twice with 100 ml of dichloromethane each time. The combined organic phases were dried over magnesium sulfate and concentrated in a vacuum. The crude product obtained was recrystallized from ethyl acetate/hexane. 7.5 g (80%) of (RS)-2-(2-oxoethyl)-6-bromo-1-indanone were obtained as a light yellow solid with m.p. 84°.

1. customSubsequently, the mixture was flushed with oxygen for 5 minutes and with argon for 10 minutes
2. additionAfter the addition of 4.09 ml of dimethyl sulfide
3. stirringthe mixture was stirred at room temperature for 15 hours
4. customThe reaction mixture was evaporated in a vacuum
5. additionThe residue was treated with 1 50 ml of dichoromethane
6. additionafter the addition of 20 ml of water and 20 ml of trifluoroacetic acid
7. stirringstirred at room temperature for 2 hours
8. additionThe mixture was subsequently poured into 100 ml of water
9. additionneutralized by the spatula-wise addition of sodium hydrogen carbonate
10. stirringwhile stirring
11. additionAn additional 50 ml of water were added
12. customThe phases were separated
13. extractionthe aqueous phase was extracted twice with 100 ml of dichloromethane each time
14. dry with materialThe combined organic phases were dried over magnesium sulfate
15. concentrationconcentrated in a vacuum
16. customThe crude product obtained
17. customwas recrystallized from ethyl acetate/hexane

ORD record

ord-a4cfe29050cf417f88aea2457c57ea1f

Source dataset

uspto-grants-1997_07

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US05646173