反应详情

Add N-chlorosuccinimide (106.7 g, 0.79 mol) to a solution of (3R)-5-bromo-3-({[tert-butyl(dimethyl)silyl]oxy}methyl)-1,2,3,4-tetrahydroisoquinoline (220 g, 0.52 mol) in tetrahydrofuran (3.85 L) at 20° C. in an appropriate vessel and stir. After 30 minutes concentrate the mixture under reduced pressure and dissolve the residues in 5% w/w potassium hydroxide in methanol (2.2 L, 1.69 moles) and stir at 20° C. After 30 minutes, add the mixture to water (3 L) and extract three times with dichloromethane (3×1 L). Dry the combined organic extracts over anhydrous magnesium sulfate and concentrate under reduced pressure to give the title compound (210 g, 0.50 mol). MS (m/z): 354(M+1 (79Br)), 356(M+1 (81Br)).

1. concentrationAfter 30 minutes concentrate the mixture under reduced pressure
2. stirringstir at 20° C
3. extractionextract three times with dichloromethane (3×1 L)
4. dry with materialDry the combined organic extracts over anhydrous magnesium sulfate
5. concentrationconcentrate under reduced pressure