Tetrahydrofuran → tert-Butyl N-{1-[(4,4-difluorocyclohexyl)methyl]piperidin-4-yl}carbamate

Participants

Reaction Conditions

Reaction Steps

A mixture of the crude product of 4,4-difluorocyclohexane-1-carbaldehyde obtained in Example 2b (1.4 g) and tetrahydrofuran (100 ml) was cooled to 0° C., tert-butyl N-(piperidin-4-yl)carbamate (2.27 g, 11.3 mmol) was added thereto, followed by stirring for 20 minutes. Sodium triacetoxyborohydride (2.2 g, 10.4 mmol) was then added to the reaction mixture, which was stirred at mom temperature for eight hours. Brine was added to the reaction mixture, which was extracted with ethyl acetate. The organic layer was dried over magnesium sulfate, and the solvent was distilled off. The residue was purified by silica gel column chromatography (elution solvent: ethyl acetate/heptane). The resulting residue was dissolved in ethyl acetate and washed with a saturated aqueous sodium bicarbonate solution, and the solvent was then distilled off to give the title compound (650 mg, yield 20.7%).

Provenance & Evidence