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温度

0 °C

Diisopropylethyl amine (17.4 ml, 134 mmol) was added a solution of (DL)-valinol (9.85 g, 95 mmol) in methylene chloride (100 ml). The reaction mixture was cooled to 0 °C., treated with a solution of p-toluoyl chloride (12.8 ml, 91 mmol ) in methylene chloride (50 ml) and then allowed to warm to room temperature. After stirring for 3 hours, excess aqueous sodium hydroxide solution was added and the reaction was transferred to a separatory funnel. The organic layer was separated and the aqueous layer washed with one portion of methylene chloride. The combined organic layers were washed with water and brine, dried over magnesium sulfate and concentrated in vacuo. Chromatography eluting with 25% ethyl acetate in hexanes, followed by 50% ethyl acetate in hexanes gave N-p-toluoyl valinol (18.04 g).

1. temperatureto warm to room temperature
2. customthe reaction was transferred to a separatory funnel
3. customThe organic layer was separated
4. washthe aqueous layer washed with one portion of methylene chloride
5. washThe combined organic layers were washed with water and brine
6. dry with materialdried over magnesium sulfate
7. concentrationconcentrated in vacuo
8. washChromatography eluting with 25% ethyl acetate in hexanes