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Amine 3 (2.32 g, 0.012 mol) was stirred in boiling 48% HBr (50 mL) for 3 h. After the reaction was completed, argon was bubbled through the solution and the solvent was evaporated under reduced pressure. The solid residue was dried above KOH to provide 3.1 g (90%) of 4. APCI MS m/z=166[C10H15NO+H]+.

1. customfor 3 h
2. customargon was bubbled through the solution
3. customthe solvent was evaporated under reduced pressure
4. dry with materialThe solid residue was dried above KOH