反应详情

(S)-2,3-Dihydro-6-hydroxy-1,4-benzodioxin-2-methanamine (2.89 g, 16.0 mmole), 7-(3-chloropropoxy)coumarin (3.46 g, 14.5 mmole), diisopropylethylamine (12.5 ml, 72 mmole) and sodium iodide (2.20 g, 14.7 mmole) were combined in 200 ml of DMF and heated at 80°-100° C. for 24 hours under a nitrogen atmosphere. The solvent was then removed in vacuum. The residue was column chromatographed on silica gel using first 0.5% methanol/dichloromethane, then 1% methanol/dichloromethane, and finally 3% methanol/dichloromethane as eluant. The product-containing fractions (Rf=0.45 on silica gel with 5% methanol/dichloromethane) were combined and rechromatographed on silica gel using first 75% ethyl acetate/dichloromethane and then 2% methanol/dichloromethane as eluant. The product-containing fractions were concentrated in vacuum and the pure free base (0.98 g) redissolved in methanol and boiled on a hot plate, the methanol gradually being replaced with isopropanol. 4N HCl/isopropanol (7.0 ml) was added and the title compound was collected by filtration and dried in vacuum at 80° C. The procedure yielded 0.71 g of white solid, monohydrochloride, m.p. 236°-239° C.

1. temperatureheated at 80°-100° C. for 24 hours under a nitrogen atmosphere
2. customThe solvent was then removed in vacuum
3. customchromatographed on silica gel using first 0.5% methanol/dichloromethane
4. customrechromatographed on silica gel using first 75% ethyl acetate/dichloromethane
5. concentrationThe product-containing fractions were concentrated in vacuum
6. dissolutionthe pure free base (0.98 g) redissolved in methanol
7. addition4N HCl/isopropanol (7.0 ml) was added
8. filtrationthe title compound was collected by filtration
9. customdried in vacuum at 80° C