Furan → 1-Oxo-1-furyl-7-methoxycarbonyl-4-heptyne

Beteiligte Stoffe

Reaktionsschritte

A mixture of 6-methoxycarbonyl-1-carboxy-3-hexyne [VI-1] (18.4 g, 0.1 mole), furan (13.6 g, 0.2 mole), dichloroacetic anhydride (28.8 g, 0.12 mole), boron trifluoride ether complex (3.2 g) and toluene (100 ml) is reacted at 20°-30° C. for 10 hours. After completion of the reaction, the reaction mixture is cooled, and washed successively with water, 5% aqueous sodium carbonate solution and water, and the organic layer is dried over anhydrous magnesium sulfate and concentrated under reduced pressure. The resulting residue is purified by silica gel column chromatography to give 1-oxo-1-furyl-7-methoxycarbonyl-4-heptyne [VII-1] (15.2 g, yield; 65%), b.p. 120°-125° C./0.3 mmHg.

Herkunft & Nachweise