Acetic Acid → Methyl 2-acetyl-3,5-diallyloxyphenylacetate

Beteiligte Stoffe

Reaktionsbedingungen

Reaktionsschritte

Methyl 3,5-diallyloxyphenylacetate (40 g, 0.14 mol) obtained in Example 5, Step 1 was dissolved in trifluoroacetic acid (0.15 L). After the solution was cooled to 4° C., acetic acid (9.5 mL, 0.17 mol) and trifluoroacetic anhydride (40 mL, 0.28 mol) were added thereto, followed by stirring at 4° C. for 3.5 hours. The reaction mixture was gradually added to a saturated aqueous solution of sodium hydrogencarbonate for neutralization, followed by extraction with ethyl acetate. The organic layer was washed with a saturated aqueous solution of sodium chloride, dried over anhydrous sodium sulfate, and then concentrated under reduced pressure. The resulting residue was purified by silica gel column chromatography (ethyl acetate/hexane=1/20-1/6) to obtain methyl 2-acetyl-3,5-diallyloxyphenylacetate (30 g, 65%).

Herkunft & Nachweise