Acetic Acid → (3S,4S)-4-[(S)-3-(4-Fluoro-benzyl)-piperidin-1-ylmethyl]-tetrahydro-pyran-3-ylamine

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Reaction Steps

[(S)-3-(4-Fluoro-benzyl)-piperidin-1-yl]-[(3S,4R)-3-aminotetrahydro-pyran-4-yl]-methanone (367 mg, 1.14 mmol) was treated with borane-tetrahydrofuran complex in tetrahydrofuran (1.0 M; 46 mL, 46 mmol) and stirred for 20 h. The mixture was treated slowly with 20% acetic acid in methanol (25 mL), and the resulting mixture was stirred at room temperature for 3 h. The solvents were removed, and the residue was dissolved in water, made basic (pH 11) with 50% sodium hydroxide, and extracted with dichloromethane. The combined organic phases were dried (Na2SO4) and concentrated to provide a gum (313 mg). A portion of this material (175 mg) was purified by flash column chromatography (5% methanol/dichloromethane, containing 0.5% ammonium hydroxide) to provide the product (103 mg, 52%) as an oil which solidified on standing.

Provenance & Evidence