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General Procedure for the Synthesis of 4-Piperidones 5 Methyltrichlorosilane (1.5 mmol) was added dropwise to a mixture of β-keto ester 4 (1 mmol) and bisaminol ether 3 (1.2 mmol) in dry MeCN (3 mL) then stirred at r.t. for 20 h. The reaction was then quenched with aq sat. NaHCO3 until basic, extracted with EtOAc (3 × 3 mL, dried (MgSO4, and concentrated in vacuo to give the crude product, which was purified by flash chromatography to afford the 4-piperidones 5 in 51-90% yields. General Procedure for the Synthesis of 4-Piperidols 6 A solution of piperidone 5 (1 mmol) in THF (4 mL) was added to a solution of NaBH4 (0.5 mmol) in THF (4 mL) and deionized H2O (4 mL, The mixture was stirred for 30 min at 0 °C, then stirred for 3 h at r.t. The reaction was quenched with 2 M NaOH and extracted with Et2O (3 × 10 mL, The combined organic extracts were washed with brine, dried MgSO4
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3), 2.53 (2 H, t, J = 6.9 Hz
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