反应详情

A mixture of 8.9 g of 6-methoxy-2H-[1]-benzopyran-3-one, 7.46 g of methyl 3-(propylamino)-propionate, 0.8 ml of trifluoroacetic acid in 80 ml to toluene is refluxed for 7 hours in a Dean Stark apparatus; additional 0.8 ml portions of trifluoroacetic acid are added at 2,4 and 6 hours. The reaction mixture is cooled and the solvent is removed in vacuo. The residue is crystallized from ether/methanol to afford 9-methoxy-4-propyl-1,2,3,5-tetrahydro-4H-[1]-benzopyrano[3,4-b]pyridin-1-one, melting point 97°-100°.

1. temperatureis refluxed for 7 hours in a Dean Stark apparatus
2. temperatureThe reaction mixture is cooled
3. customthe solvent is removed in vacuo
4. customThe residue is crystallized from ether/methanol