反应详情

A suspension of 0.65 g (1.1 eq) of 95% NaH in 22 ml of toluene was slowly added to 3.8 g (1 eq) of methyl diethylphosphonoacetate in 5 ml of dry toluene below 35° C. The clear yellow solution was allowed to stir under nitrogen at room temperature for 30 min and a solution of 2.5 g (18.2 mmol) of 2-methoxy-pyridine-5-carboxaldehyde in 10 ml of toluene was added dropwise while maintaining the reaction temperature below 40° C. After the addition, the mixture was heated at 65° C. for 30 min, cooled, and filtered through solka floc and concentrated in vacuo to yield 3 g (85.7%) of methyl β-(2-methoxypyridin-5-yl)acrylate (cis/trans mixture).

1. temperaturewhile maintaining the reaction temperature below 40° C
2. additionAfter the addition
3. temperaturethe mixture was heated at 65° C. for 30 min
4. temperaturecooled
5. filtrationfiltered through solka floc
6. concentrationconcentrated in vacuo