Methanol → 4-(6-Fluoro-3,4-dihydroxyphenyl)-1,2,3,4-tetrahydroisoquinoline hydrobromide

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Reaktionsschritte

1.15 g of 4-(6-fluoro-3,4-dimethoxyphenyl)-1,2,3,4-tetrahydroisoquinoline was dissolved in 30 ml of dichloromethane, 26.4 ml of 1M boron tribromide-dichloromethane solution was added to the solution under an argon gas stream under stirring under cooling at the internal temperature of -20° to -30° C. The mixture was stirred for 3 hours at room temperature, and then, 7.0 ml of methanol was added dropwise under cooling in dry ice-methanol bath. The mixture was stirred for 30 minutes at room temperature, the crystals which separated out were collected by filtration, affording 1.0 g of 4-(6-fluoro-3,4-dihydroxyphenyl)-1,2,3,4-tetrahydroisoquinoline hydrobromide.

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