反应详情

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).

1. temperaturethe mixture was heated
2. temperatureat reflux for 2 hours under hydrogen
3. filtrationAfter completion of the hydrogen uptake, the mixture was filtered
4. washwashed with methanol and methylene chloride
5. concentrationconcentrated on a rotary evaporator
6. distillationResidual water was distilled off azeotropically by the addition of methylene chloride
7. customThe oil obtained
8. customwas recrystallized from hexane/ether