7-(Benzyloxy)-4-hydroxy-2H-1-benzopyran-2-one → 4,7-Dihydroxycoumarin
反応式
C([O:8][C:9]1[CH:18]=[C:17]2[C:12]([C:13]([OH:20])=[CH:14][C:15](=[O:19])[O:16]2)=[CH:11][CH:10]=1)C1C=CC=CC=1>[Pd].CO>[OH:20][C:13]1[C:12]2[C:17](=[CH:18][C:9]([OH:8])=[CH:10][CH:11]=2)[O:16][C:15](=[O:19])[CH:14]=1参加物
4
実験手順
A 300 cc autoclave was charged with 7-benzyloxy-4-hydroxycoumarin (3 g, 3.7 mmol), prepared in accordance with Example 5, 5% Pd on carbon (0.18 g) and 85 mL of methanol and the autoclave was purged with N2. The autoclave was pressurized with H2 to a pressure of about 100 psi and maintained at that pressure. The exothermic reaction was carried out at ~50° C. for ~2hrs. After the completion of hydrogenolysis, the reactor was flushed with N2 and the contents were transferred into a beaker using a long pipet. The mixture containing Pd/C was dried over MgSO4 and filtered through a frit. The filtrate was evaporated to dryness and finally dried overnight at 45° C. The purity of the material as determined by LC was 95%; yield ~90%. The product was characterized by NMR.