Boron tribromide → HCID 12773913, compound

Participants

Reaction Steps

To a solution of 1-(4-chlorophenoxy)methyl-6-hydroxy-7-methoxy-1,2,3,4-tetrahydroisoquinoline (100 mg) in anhydrous methylene chloride (5 ml) was added boron tribromide (140 mg) at -60° C. under cooling and stirring, and then the reaction temperature was gradually elevated to at 15° C. over 22 hours. After the reaction, the reaction mixture was concentrated, and oily residue was dissolved in methanol (5 ml) and water (0.5 ml). The solution was refluxed for 10 minutes, and then the solvent was distilled off. The amorphous residue was dissolved in acetone, and to the solution was added ether, and the mixture was allowed to stand. The precipitated crystals were collected by filtration and dried to give 1-(4-chlorophenoxy)methyl-6,7-dihydroxy-1,2,3,4-tetrahydroisoquinoline hydrobromide (81 mg), mp 232° to 233° C. The product was identified with a sample by I.R. spectrum and N.M.R. spectrum.

Provenance & Evidence