Ozone → HCID 13926372, compound

An ozone stream (3.5 g ozone/hour) was conducted while stirring for 2 hours through a solution, cooled to -70°, of 24.6 g of (RS)-2-(2-buten-1-yl)-4-chromanone in 450 ml of anhydrous dichloromethane and 150 ml of anhydrous methanol. Subsequently, the solution was flushed with oxygen for 5 minutes and with argon for 15 minutes. After the addition of 13.4 ml of dimethyl sulfide, the mixture was stirred at room temperature for 20 hours. The reaction mixture was subsequently evaporated in a vacuum. The residue was treated with 250 ml of dichloromethane and, after the addition of 40 ml of water and 40 ml of trifluoroacetic acid, stirred at room temperature for 4 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 70 ml of water were added, the phases were separated and the aqueous phase was extracted twice with 120 ml of dichloromethane each time. The combined organic phases were dried over magnesium sulfate and concentrated in a vacuum. 22.7 g (99%) of 2-(2-oxoethyl)-4-chromanone were obtained as a yellow oil which was used in the next reaction without additional purification.

1. customSubsequently, the solution was flushed with oxygen for 5 minutes and with argon for 15 minutes
2. additionAfter the addition of 13.4 ml of dimethyl sulfide
3. stirringthe mixture was stirred at room temperature for 20 hours
4. customThe reaction mixture was subsequently evaporated in a vacuum
5. additionThe residue was treated with 250 ml of dichloromethane
6. additionafter the addition of 40 ml of water and 40 ml of trifluoroacetic acid
7. stirringstirred at room temperature for 4 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 70 ml of water were added
12. customthe phases were separated
13. extractionthe aqueous phase was extracted twice with 120 ml of dichloromethane each time
14. dry with materialThe combined organic phases were dried over magnesium sulfate
15. concentrationconcentrated in a vacuum

ORD record

ord-54ba5e0a61e7451f9166b5501f328e10

Source dataset

uspto-grants-1997_07

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US05646173