反应详情

温度

94 °C

N-Ethyl-2,3-dihydro-7-hydroxy-1,4-benzodioxin-2-methanamine (2.11 g, 13.1 mmole), 7-(3-chloropropoxy)coumarin (3.44 g, 14.4 mmole), diisopropylethylamine (11 ml, 63.2 mmole) and sodium iodide (1.98 g, 13.2 mmole) were combined in 175 ml of DMF and heated at 94° C. for 2 days under a nitrogen atmosphere. The solvent was then removed in vacuum and the residue column chromatographed on silica gel using first 0.5% methanol/dichloromethane and then 1.5% methanol/dichloromethane as eluant. The product-containing fractions were combined and concentrated in vacuum and the residue redissolved in dichloromethane and boiled on a hot plate, the dichloromethane gradually being replaced with isopropanol. 4N HCl/isopropanol (4 ml) was added and the title compound was collected by filtration. A second recrystallization from isopropanol yielded 0.73 g of white solid, monohydrochloride, m.p. 208°-215° C.

1. customThe solvent was then removed in vacuum
2. customthe residue column chromatographed on silica gel using first 0.5% methanol/dichloromethane
3. concentrationconcentrated in vacuum
4. dissolutionthe residue redissolved in dichloromethane
5. addition4N HCl/isopropanol (4 ml) was added
6. filtrationthe title compound was collected by filtration
7. customA second recrystallization from isopropanol