(2R,3R)-4-(2',5'-dimethoxy-3',4',6'-trimethylphenyl)-2,3-epoxy-2-methylbutanol → (S)-4-(2,5-dimethoxy-3,4,6-trimethylphenyl)-2-methyl-1,2-butanediol

反応式

[CH3:1][O:2][C:3]1[C:8]([CH3:9])=[C:7]([CH3:10])[C:6]([O:11][CH3:12])=[C:5]([CH3:13])[C:4]=1[CH2:14][C@H:15]1[O:20][C@:16]1([CH3:19])[CH2:17][OH:18]>CO.O.[Ni]>[CH3:1][O:2][C:3]1[C:8]([CH3:9])=[C:7]([CH3:10])[C:6]([O:11][CH3:12])=[C:5]([CH3:13])[C:4]=1[CH2:14][CH2:15][C@:16]([CH3:19])([OH:20])[CH2:17][OH:18]

参加物

実験手順

185 mg of (2R,3R)-4-(2',5'-dimethoxy-3',4',6'-trimethylphenyl)-2,3-epoxy-2-methylbutanol were dissolved in 5 ml of methanol and the solution was subsequently diluted with 5 ml of water. Thereupon, Raney-nickel was added and the mixture was heated at reflux for 2 hours under hydrogen. After completion of the hydrogen uptake, the mixture was filtered, washed with methanol and methylene chloride and concentrated on a rotary evaporator. Residual water was distilled off azeotropically by the addition of methylene chloride. The oil obtained was recrystallized from hexane/ether and there were obtained 161 mg of 55% (S)-4-(2',5'-dimethoxy-3',4',6'-trimethylphenyl)-2-methyl-1,2-butanediol (48% yield; analysis of the acetonide by gas chromatography). Data of the pure substance: m.p. 86°-87° C. [α]D20 +2.55° (c=5.3% in CHCl3).