反应详情

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

1. temperaturethe mixture is heated
2. temperatureat reflux under hydrogen for 2 hours
3. filtrationis filtered
4. washthe filter residue is washed with methanol and methylene chloride
5. concentrationthe combined filtrate and washings are concentrated on a rotary evaporator
6. distillationResidual water is distilled off azeotropically by the addition of methylene chloride
7. customThe oil obtained
8. customis recrystallized from n-hexane/diethyl ether and there