Bromine → 1-Methoxycarbonylmethoxy-5-oxo-6-bromo-5,6,7,8-tetrahydronaphthalene
反応式
[CH3:1][O:2][C:3]([CH2:5][O:6][C:7]1[C:16]2[CH2:15][CH2:14][CH2:13][C:12](=[O:17])[C:11]=2[CH:10]=[CH:9][CH:8]=1)=[O:4].[Br:18]Br>ClCCl>[CH3:1][O:2][C:3]([CH2:5][O:6][C:7]1[C:16]2[CH2:15][CH2:14][CH:13]([Br:18])[C:12](=[O:17])[C:11]=2[CH:10]=[CH:9][CH:8]=1)=[O:4]参加物
4
実験手順
To a solution of 1-methoxycarbonylmethoxy-5-oxo-5,6,7,8-tetrahydronaphthalene (0.5 g) in dry dichloromethane (3 ml) was added bromine (0.14 ml) at 0° C. The mixture was warmed up to room temperature, stirred for 2 hours. The mixture was washed with an aqueous saturated sodium bicarbonate, dried over magnesium sulfate and evaporated in vacuo. The residue was chromatographed on silica gel (30 ml) using a mixture of dichloromethane--n-hexane. The desired fractions were collected and evaporated in vacuo to give 1-methoxycarbonylmethoxy-5-oxo-6-bromo-5,6,7,8-tetrahydronaphthalene (0.41 g). The crude crystal (50 mg) was recrystallized from ethyl acetate--n-hexane to give 31 mg as a white crystal.