[Br:1][C:2]1[CH:3]=[CH:4][C:5]([CH:8]2[CH2:17][CH2:16][C:11]3(OCC[O:12]3)[CH2:10][CH2:9]2)=[N:6][CH:7]=1.O.[OH-].[Na+]>FC(F)(F)C(O)=O>[Br:1][C:2]1[CH:3]=[CH:4][C:5]([CH:8]2[CH2:9][CH2:10][C:11](=[O:12])[CH2:16][CH2:17]2)=[N:6][CH:7]=15-Bromo-2-(1,4-dioxaspiro[4,5]decane-8-yl)pyridine (9.0 g) described in Reference Example 102(2) was dissolved in trifluoroacetic acid (15 ml) and stirred at room temperature overnight. After completion of the reaction, water was added under ice cooling, neutralized by the addition of 4N aqueous solution of sodium hydroxide and extracted with ethyl acetate. The organic layer was washed with saturated brine, dried over anhydrous sodium sulfate and concentrated to give 4-(5-bromopyridin-2-yl)cyclohexanone (7.9 g) as a pale yellow solid.
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