Triethylamine → 1-[1-(4-Cyanophenethyl)piperidin-4-yl]indoline

Participants

Reaction Steps

1-[1-(4-Hydroxyiminomethylphenethyl)piperidin-4-yl]indoline (0.466 g) was dissolved in methylene chloride (6.5 ml) and triethylamine (0.35 ml) was added thereto. In a nitrogen atmosphere at −78° C., trifluoroacetic anhydride (0.14 ml) was added dropwise into the resultant solution followed by stirring for 3 hr. After adding a saturated aqueous solution of sodium bicarbonate, the resultant mixture was extracted with ethyl acetate, washed with brine, dried over anhydrous magnesium sulfate and concentrated under reduced pressure. The residue was purified by silica gel column chromatography (ethyl acetate/methylene chloride/methanol system) to give the title compound (0.126 g) as a pale yellow oil (yield: 28.9%).

Provenance & Evidence