Diisobutylaluminumhydride → [4,5-Dimethoxy-2-(1-methyl-2-phenyl-ethyl)-phenyl]-methanol
反応式
[H-].C([Al+]CC(C)C)C(C)C.C[O:12][C:13](=O)[C:14]1[CH:19]=[C:18]([O:20][CH3:21])[C:17]([O:22][CH3:23])=[CH:16][C:15]=1[CH:24]([CH3:32])[CH2:25][C:26]1[CH:31]=[CH:30][CH:29]=[CH:28][CH:27]=1>C1COCC1>[CH3:23][O:22][C:17]1[C:18]([O:20][CH3:21])=[CH:19][C:14]([CH2:13][OH:12])=[C:15]([CH:24]([CH3:32])[CH2:25][C:26]2[CH:31]=[CH:30][CH:29]=[CH:28][CH:27]=2)[CH:16]=1参加物
4
実験手順
Diisobutyl aluminum hydride (22.9 mL, 1.0 M in THF) was added to a solution of 4,5-dimethoxy-2-(1-methyl-2-phenyl-ethyl)-benzoic acid methyl ester (2.886 g, 9.2 mmol) in 100 mL THF at −78° C. over 10 min. The mixture was allowed to stir for 1 h and warmed to room temperature. After 1.5 hours the mixture was quenched by the slow addition of 50 mL saturated Rochelle's salt. After rapidly stirring for 30 minutes the mixture was filtered through a pad of celite and concentrated in vacuo. H2O was added and the slurry was extracted with ethyl acetate, washed with H2O and washed with brine. The combined organics were dried over Na2SO4, filtered and concentrated in vacuo to give a crude oil. Purification via flash chromatography (3:1 hexane/ethyl acetate) afforded [4,5-dimethoxy-2-(1-methyl-2-phenyl-ethyl)-phenyl]-methanol as a clear oil (1.269 g, 48%).