[C:1]1([C:7]2([C:13]3[CH:18]=[CH:17][CH:16]=[CH:15][CH:14]=3)[C:11](=[O:12])[CH:10]=[CH:9][CH2:8]2)[CH:6]=[CH:5][CH:4]=[CH:3][CH:2]=1.[H-].C([Al+]CC(C)C)C(C)C.C(OCC)(=O)C.Cl>C1(C)C=CC=CC=1>[C:1]1([C:7]2([C:13]3[CH:18]=[CH:17][CH:16]=[CH:15][CH:14]=3)[CH:11]([OH:12])[CH:10]=[CH:9][CH2:8]2)[CH:2]=[CH:3][CH:4]=[CH:5][CH:6]=1To a suspension of 5,5-diphenyl-2-cyclopenten-1-one (5.0 g) in toluene (25 ml) was added dropwise diisobutylaluminum hydride (15 ml, 1.5M solution in toluene) for 10 minutes at -78° C. to -50° C. After 30 minutes, ethyl acetate (5 ml) was added to the resultant yellow solution. The solution was acidified to pH 1 with 6N hydrochloric acid (20 ml) and extracted with ethyl acetate. The extract was washed with brine, dried over magnesium sulfate and evaporated in vacuo. The residue was purified by column chromatography on silica gel with methylene chloride as an eluent and further purified by bulb to bulb distillation to give 5,5-diphenyl-2-cyclopenten-1-ol (2.46 g).
読み込み中…
