To a solution of ketone 8 (1.20 g, 2.48 mmol) in 50 mL of chloroform was added 70%-mCPBA (3.23 g, 15 mmol). The reaction mixture was heated to 30–35 °C and after 4 h another portion of 70%-mCPBA (0.91 g, 4.22 mmol) was added. The reaction was monitored by TLC, there was still presence of the substrate. After 24 h (the substrate was still present on TLC), another portion of 70%-mCPBA (0.58 g, 2.69 mmol) was added. After 12 h (there was only a trace of the substrate, TLC), 30 mL solution of 10%-Na2S2O3 was slowly added (the temperature of the mixture increases). The mixture was transferred to a separatory funnel and the organic layer was washed with 30 mL of saturated NaHCO3 solution. The solvent was evaporated under reduced pressure and the obtained residue was purified by column chromatography (H:OAc 20:1→3:1 v/v) to give 1.06 g (85%) of 9 as a white solid.

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