反应详情

Into a 500-mL 3-necked round-bottom flask purged and maintained with an inert atmosphere of nitrogen, was placed 2-(benzyloxy)-3-methylbenzaldehyde (20 g, 88.39 mmol, 1.00 equiv), propanedioic acid (27.6 g, 265.23 mmol, 3.00 equiv), piperidine (1.5 g, 17.62 mmol, 0.20 equiv) and pyridine (200 mL). The resulting solution was heated to reflux for 2 h in an oil bath. The reaction was then quenched by the addition of 1.5 L of water/ice. The pH value of the solution was adjusted to 2-3 with hydrogen chloride. The solids were collected by filtration. The filter cake was washed with 2×500 mL of water and 2×500 mL of hexane. This resulted in 21 g (89%) of (2Z)-3-[2-(benzyloxy)-3-methylphenyl]prop-2-enoic acid as a white solid. MS (ESI) m/z 269 ([M+H]+).

1. customInto a 500-mL 3-necked round-bottom flask purged
2. temperaturemaintained with an inert atmosphere of nitrogen
3. temperatureThe resulting solution was heated
4. temperatureto reflux for 2 h in an oil bath
5. customThe reaction was then quenched by the addition of 1.5 L of water/ice
6. filtrationThe solids were collected by filtration
7. washThe filter cake was washed with 2×500 mL of water and 2×500 mL of hexane
8. customThis resulted in 21 g (89%) of (2Z)-3-[2-(benzyloxy)-3-methylphenyl]prop-2-enoic acid as a white solid