To a cooled (ice bath) solution of monoacetate 7 (1.40 g, 2.88 mmol) in 50 mL of DCM, PCC (3.68 g, 17.07 mmol) was slowly added in small portions over 5 min. The reaction was monitored by TLC. After 4 h, the flask with the reaction mixture was placed in the freezer overnight. The solvent was evaporated under reduced pressure and the obtained residue was purified by column chromatography (H:OAc 1:1 v/v) to give 1.30 g (92%) of the ketone 8 as a white solid.

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