Potassium Hydroxide → 2-Hydroxymethyl-3-(5-carboethoxypentyloxy)-4-pyrone

Beteiligte Stoffe

Reaktionsschritte

To a solution of 2.75 g (0.042 mole) of potassium hydroxide in 38 ml of ethanol and 10 ml of water was added 5.93 g (0.042 mole) of 2-hydroxymethyl-3-hydroxy-4-pyrone, and the resulting mixture heated to 50°. A 12.4 g (0.046 mole) portion of ethyl 6-iodohexanoate was then added and the resulting clear solution heated at reflux for 7 hr under a nitrogen atmosphere. Removal of the ethanol under reduced pressure left a residue which was dissolved in methylene chloride. The organic solution was washed successively with aqueous NaHCO3 and saturated brine, was dried over magnesium sulfate, and was evaporated to afford a viscous oil. This material was chromatographed on silica gel eluting with ethyl acetate to give 6.34 g (54%) of oily product, 2-hydroxymethyl-3-(5-carboethoxypentyloxy)-4-pyrone: NMR (CDCl3): δ1.22 (3H, t, J=7Hz), 2.30 (2H, t, J=5.5 Hz), 4.63 (2H, s), 6.35 (1H, d, J=6 Hz), 7.73 (1H, d, J=6 Hz).

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