反应详情

Palladium hydroxide on carbon (19.7 g) was suspended in methanol (500 ml), to the suspension was added a solution of N-[2-methyl-1-(naphthalen-2-yl)propan-2-yl]-benzyloxycarboxamide (237.6 g) obtained in Step 11 in methanol (2 L), and a hydrogenation reaction was performed at room temperature overnight. After filtration of the reaction mixture, the filtrate was concentrated under reduced pressure. To the obtained residue was added ethyl acetate, and to the solution was added conc. hydrochloric acid (70 ml) to give crystals. The obtained crystals were suspended in water, and after an addition of 4N aqueous sodium hydroxide solution (350 ml), the mixture was extracted with ethyl acetate. The ethyl acetate layer was dried over anhydrous sodium sulfate and concentrated under reduced pressure to give crystals of the title compound (138 g).

1. customa hydrogenation reaction
2. filtrationAfter filtration of the reaction mixture
3. concentrationthe filtrate was concentrated under reduced pressure
4. additionTo the obtained residue was added ethyl acetate
5. additionto the solution was added conc. hydrochloric acid (70 ml)
6. customto give crystals
7. extractionthe mixture was extracted with ethyl acetate
8. dry with materialThe ethyl acetate layer was dried over anhydrous sodium sulfate
9. concentrationconcentrated under reduced pressure