Boron trifluoride etherate → 4-Hydroxy-3-(1-(1-naphthyl)-propyl)-coumarin

Beteiligte Stoffe

Reaktionsschritte

To a cloudy solution of 324 mg of 4-hydroxycoumarin and 373 mg of 1-(1-naphthyl)-propan-1-ol of Preparation 22 in 7 mL of dioxane under an argon atmosphere is added 0.85 mL of boron trifluoride etherate. After stirring overnight the resulting yellow solution is concentrated under reduced pressure. The residue is partioned between water and ethyl acetate; the organic phase is washed with brine, dried (magnesium sulfate), and concentrated. The residue is adsorbed onto silica gel and then flashed column chromatographed using 40% to 50% ethyl acetate in hexane to yield 337 mg of the title product as a pale yellow solid. An analytical sample may be prepared by crystallization from ethyl acetate-hexanes.

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