Ozone → (RS)-2-(2-oxoethyl)-4-methoxy-1-indanone

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An ozone stream (3 g ozone/hour) was conducted while stirring for 35 minutes through a solution, cooled to -70°, of 6.42 g of (RS)-2-(2-buten-1-yl)-4-methoxy-1-indanone in 180 ml of anhydrous dichloromethane and 60 ml of anhydrous methanol. Subsequently, the solution was flushed with oxygen for 5 minutes and with argon for 10 minutes. After the addition of 3.3 ml of dimethyl sulfide, the mixture was stirred at room temperature for 16 hours. The reaction mixture was evaporated in a vacuum, the residue was treated with 200 ml of dichloromethane 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 100 ml of water were added, the phases were separated and the aqueous phase was extracted twice with 150 ml of dichloromethane each time. The combined organic phases were dried over magnesium sulfate, concentrated in a vacuum and the crude product obtained was crystallized from ethyl acetate/hexane. 5.1 g (84%) of (RS)-2-(2-oxoethyl)-4-methoxy-1-indanone were obtained as a white solid with m.p. 71°.

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