[F:1][C:2]([F:15])([F:14])[O:3][C:4]1[CH:9]=[CH:8][C:7]([OH:10])=[C:6]([C:11](=[O:13])[CH3:12])[CH:5]=1.[CH3:16][C:17]([CH:19]([O:22][CH3:23])[O:20][CH3:21])=O.N1CCCC1>C1(C)C=CC=CC=1>[CH3:21][O:20][CH:19]([O:22][CH3:23])[C:17]1([CH3:16])[CH2:12][C:11](=[O:13])[C:6]2[CH:5]=[C:4]([O:3][C:2]([F:14])([F:15])[F:1])[CH:9]=[CH:8][C:7]=2[O:10]1To a solution of 0.5 g (2.27 mmole) of the compound obtained in step 2 dissolved in 10 ml of toluene were added 0.55 ml (4.54 mmole) of pyruvic aldehyde dimethyl acetal and 80 mg (1.14 mmole) of pyrrolidine. The reactants were heated to reflux for about 12 hours using Dean-Stark apparatus. After completion of the reaction, toluene solvent was removed therefrom under reduced pressure. The residue so obtained was extracted with ethyl acetate and concentrated to give residue, which was purified by silica gel column chromatography using as an eluent a mixture of hexane and ethyl acetate of 10:1 to obtain 0.470 g (yield 65%) of the title compound.
Wird geladen…
