[OH-:1].[Na+].O=[C:4]([C:12]1[CH:17]=[CH:16][C:15]([O:18][CH3:19])=[C:14]([O:20][CH3:21])[C:13]=1[O:22][CH3:23])[CH2:5][CH2:6][CH2:7]CC(O)=O.[OH2:24]>CO>[CH3:23][O:22][C:13]1[C:14]([O:20][CH3:21])=[C:15]([O:18][CH3:19])[CH:16]=[CH:17][C:12]=1[CH2:4][CH2:5][CH2:6][C:7]([OH:24])=[O:1]17 g of sodium hydroxide was dissolved in 200 mL of methanol in a 1000 mL round bottom flask. The reaction mixture was cooled to room temperature and 66 (6.78 g, 22.90 mmol) was added followed by 60 mL of water and 300 mL of anhydrous methanol, and the reaction mixture was refluxed for 30 min. The solvent was evaporated under reduced pressure and the reaction mixture was neutralized with dilute hydrochloric acid and the reaction mixture was extracted with ether (200×3) and the combined organic phases were washed with water and dried over sodium sulfate and solvent evaporated under reduced pressure. The crude product was purified by column chromatography (30:70 EA:Hex) to yield 12.86 g of 57 as pale yellow colored oil (78%). Rf: 0.15 (40:60 EtOAc:Hexanes).
Wird geladen…
