反应详情

4-(3-Cyano-6,6-dimethyl-11-oxo-6,11-dihydro-5H-benzo[b]carbazol-8-yl)-3,6-dihydro-2H-pyridine-1-carboxylic acid tert-butyl ester (Compound B2-22-1, 16.2 g, 34.6 mmol) was dissolved in THF (800 ml) and methanol (230 ml), added with 10 wt % Pd/C (3.2 g), and stirred under hydrogen atmosphere for 19 hr. The solid was filtered through Celite, eluted with a mixture solvent (400 ml; THF/methanol=4/1), and concentrated under reduced pressure. The residues were dissolved in ethyl acetate (400 ml), and then washed with 1% aqueous solution of N-acetylcysteine, saturated aqueous solution of NaHCO3 and saturated brine. The organic layer was dried over sodium sulfate. The drying agent was removed by filtration and the residues were concentrated under reduced pressure to obtain the title compound as a crude product (white powder, 14.0 g, 86%).

1. filtrationThe solid was filtered through Celite
2. washeluted with a mixture solvent (400 ml; THF/methanol=4/1)
3. concentrationconcentrated under reduced pressure
4. dissolutionThe residues were dissolved in ethyl acetate (400 ml)
5. washwashed with 1% aqueous solution of N-acetylcysteine, saturated aqueous solution of NaHCO3 and saturated brine
6. dry with materialThe organic layer was dried over sodium sulfate
7. customThe drying agent was removed by filtration
8. concentrationthe residues were concentrated under reduced pressure