1-Hydroxybenzotriazole hydrate → 1-t-Butoxycarbonyl-4-{1-(4-fluorophenyl)-2-[4-(naphthalen-1-yl-butyl)piperazin-1-yl]-2-oxoethyl}-4-hydroxypiperidine

Participants

Reaction Steps

2.37 g of 1-t-Butoxycarbonyl-4-[carboxy-(4-fluorophenyl)methyl]-4-hydroxypiperidine obtained in Example 11(1) was dissolved in 20 ml of dimethylformamide, and 2.50 g of 1-(4-naphthalen-1-yl-butyl)piperazine dihydrochloride, 1.9 g of 1-(3,3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride, 1.9 g of 1-hydroxybenzotriazole monohydrate and 3.5 ml of triethylamine were added, followed by stirring at room temperature overnight. The reaction solution was diluted with ethyl acetate and washed with a saturated aqueous sodium bicarbonate solution and a saturated aqueous sodium chloride solution. The organic layer was dried over anhydrous sodium sulfate. After removal of the drying agent by filtration, the filtrate was concentrated under reduced pressure. The residue was purified by a silica gel column chromatography (Chromatorex NH, hexane:ethyl acetate=3:1) to give 1.96 g of 1-t-butoxycarbonyl-4-{1-(4-fluorophenyl)-2-[4-(naphthalen-1-yl-butyl)piperazin-1-yl]-2-oxoethyl}-4-hydroxypiperidine as an oil.

Provenance & Evidence