反応 #5669

反応方程式

2,3-Dihydro-7-hydroxy-1,4-benzodioxin-2-methanamine hydrochloride

7-(3-bromopropoxy)chromen-4-one

diisopropylethylamine

→

title compound

収率 10.1%

7-[3-[(7-Hydroxy-2,3-dihydro-benzo[1,4]dioxin-2-ylmethyl)amino]propoxy]chromen-4-one

収率 10.1%

溶媒

DMF

反応条件

後処理

1. 1
   その他The solvent was then removed
2. 2
   洗浄The mixture was washed with an equal volume of saturated aqueous sodium bicarbonate, with saturated aqueous sodium chloride
3. 3
   乾燥dried over anhydrous magnesium sulfate
4. 4
   ろ過filtered
5. 5
   濃縮concentrated in vacuum
6. 6
   その他The residue was chromatographed on a silica gel column
7. 7
   workup.ADDITIONThe fractions containing material with Rf=0.37 on silica gel tlc (chloroform/methanol/ammonia=95/5/1)
8. 8
   濃縮concentrated
9. 9
   その他the residual solid was recrystallized from ethanol with the addition of 4N isopropanolic HCl and ether

実験手順

2,3-Dihydro-7-hydroxy-1,4-benzodioxin-2-methanamine hydrochloride (4.7 g, 22 mmole), 7-(3-bromopropoxy)chromen-4-one (6.1 g, 22 mmole) and diisopropylethylamine (18.8 ml, 108 mmole) were combined in 200 ml of DMF and heated at 80° C. for 24 hours under a nitrogen atmosphere. The solvent was then removed and replaced with dichloromethane. The mixture was washed with an equal volume of saturated aqueous sodium bicarbonate, with saturated aqueous sodium chloride, dried over anhydrous magnesium sulfate, filtered, and concentrated in vacuum. The residue was chromatographed on a silica gel column using first dichloromethane and then 5% methanol/dichloromethane as eluents. The fractions containing material with Rf=0.37 on silica gel tlc (chloroform/methanol/ammonia=95/5/1) were combined, concentrated, and the residual solid was recrystallized from ethanol with the addition of 4N isopropanolic HCl and ether to give 0.85 g of title compound as a light brown solid hydrochloride, quarter hydrate, m.p. 186°-189° C.

出典