Hydrogen Bromide → 4-[2-(4-Aminophenyl)ethyl]benzene-1,2-diol

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Reaction Steps

A mixture of 20 g (78 mmol) of 4-[2-[3,4-dimethoxyphenyl)ethyl]aniline which is prepared in preparation 1 above and 300 ml of of 48% hydrobromic acid is stirred at reflux under nitrogen for seven hours and at room temperature overnight. The resultant precipitate is collected, washed with ether, and redissolved in 1 N.NaOH. The solution is acidified to pH 6 with glacial HOAc and the resultant precipitate is collected as crude product. Recrystallization from H20 and then from MeOH yields the 4-[2-(3,4-dihydroxyphenyl)ethyl]benzenamine as an acetate salt; yield, 13.4 g (76%), mp 216°-218° C.

Provenance & Evidence