Acetaldehyde → Methyl 3-{[(2R*,6S*)-1-benzyl-2,6-dimethylpiperidin-4-yl](ethyl)amino}-2-methyl-5-(trifluoromethyl)benzoate

Participants

Reaction Conditions

Reaction Steps

To a stirred solution of methyl 3-{[(2R,6S)-1-benzyl-2,6-dimethylpiperidin-4-yl]amino}-2-methyl-5-(trifluoromethyl)benzoate (223 mg, 0.513 mmol) in chloroform (4 mL) and acetic acid (500 uL) was added acetaldehyde (1.0 ml) and stirred for 30 min at 0° C. Then sodium triacetoxyborohydride (343 mg, 1.54 mmol) was added to the reaction mixture at 0° C. The reaction mixture was stirred at 23° C. for 4 hours. Then the reaction mixture was quenched with aq. NaHCO3 until pH8-9. The content was extracted with ethylacetate. The organic layer was washed with brine. The organic layer was dried over MgSO4 and filtered. The filtrate was concentrated in vacuo. The residue was purified by silica gel column chromatography (heptane/ethylacetate=4/1 to 1/2) to give the titled compound as a colorless oil. (105.5 mg, 44% yield). MS (ES) [M+H] 463.3.

Provenance & Evidence