反应详情

Malonic acid (104 g; 1 mole) was dissolved in a mixture of furfural (96 g; 1 mole), pyridine (72 ml) and ethanol (10 ml) and pumped through the CMR (15 ml/min; 165° C.; 1200 kPa). The product mixture was diluted with diethyl ether (200 ml) and washed with 5% aqueous sulphuric acid (4×200 ml) to remove most of the pyridine. The remaining solution was evaporated to dryness on a rotary evaporator and the resultant 2-furanacrylic acid (25 g; 18% yield) crystallised from water m. p. 141° C. The MS was in close agreement with spectrum in the MS library. For a convention preparation see ref.18.

1. custompumped through the CMR (15 ml/min; 165° C.; 1200 kPa)
2. washwashed with 5% aqueous sulphuric acid (4×200 ml)
3. customto remove most of the pyridine
4. customThe remaining solution was evaporated to dryness on a rotary evaporator