[Br:1][CH:2](Br)[C:3]([C:5]1[CH:10]=[CH:9][C:8]([N:11]2[CH2:16][CH2:15][CH2:14][CH2:13][CH2:12]2)=[CH:7][CH:6]=1)=[O:4].C(OP([O-])OCC)C.C(N(CC)CC)C>O1CCCC1>[Br:1][CH2:2][C:3]([C:5]1[CH:10]=[CH:9][C:8]([N:11]2[CH2:16][CH2:15][CH2:14][CH2:13][CH2:12]2)=[CH:7][CH:6]=1)=[O:4]2,2-Dibromo-1-[4-(1-piperidinyl)phenyl]ethanone (3 g, 8.3 mmol) (from Step A above) was dissolved in tetrahydrofuran (15 mL), and cooled to 0° C. To the resulting solution were added dropwise diethylphosphite (1.13 mL, 8.7 mmol) and triethylamine (1.21 mL, 8.7 mmol) in tetrahydrofuran (7 mL) at 0° C. with stirring. The mixture was slowly warmed to room temperature and stirred for 6 h. The reaction mixture was concentrated in vacuo and poured into ice/water. The precipitate was collected by filtration, washed with water and dried in vacuo to provide 2-bromo-1-[4-(1-piperidinyl)phenyl]ethanone (2.3 g, 100% yield).
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