Br.[OH:2][C:3]1[C:12]([OH:13])=[CH:11][CH:10]=[C:9]2[C:4]=1[CH2:5][CH2:6][CH:7]([NH:15][CH3:16])[C:8]2=O.[ClH:17]>[Pd].O>[ClH:17].[OH:2][C:3]1[C:12]([OH:13])=[CH:11][CH:10]=[C:9]2[C:4]=1[CH2:5][CH2:6][CH:7]([NH:15][CH3:16])[CH2:8]2A mixture of 10.0 g of 5,6-dihydroxy-2-methylamino-1-tetralone hydrobromide, 2.0 g of Pd/C 5%, 90 ml of water and 10 ml of 37% HCl is hydrogenated in an autoclave (Hastelloy) (20 atm, 80° C.) for 8-9 hours, then is filtered washing with hot water. The aqueous solution is concentrated under vacuum and the resulting solid is warm triturated with 100 ml of 37% hydrochloric acid, then cooled to 0° C. and filtered. The resulting solid is recrystallized from acetone and dried under vacuum at 60° C. Yield: 7.4 g.
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