反应详情

In 30 ml of tetrahydrofuran was dissolved 1.0 g of methyl (N-(4-chlorobenzyloxycarbonyl)-tyrosinate. To the solution was added dropwise 10 ml of tetrahydrofuran solution containing 4.2 ml of sodium dihydro-bis-(2-methoxyethoxy) aluminate (65% toluene solution) with stirring while cooling with ice. The mixture was stirred at room temperature for one hour. After addition of 200 ml of 3% hydrochloric acid, the reaction mixture was concentrated in vacuo and extracted with ethyl acetate. The extract was washed with water. dried and concentrated to dryness. The residue was dissolved in chloroform and subjected to column chromatography with 10 g of silicagel to give 509 mg of N-(4-chlorobenzyloxycarbonyl)-tyrosinol: yield 56%.

1. temperaturewhile cooling with ice
2. stirringThe mixture was stirred at room temperature for one hour
3. concentrationthe reaction mixture was concentrated in vacuo
4. extractionextracted with ethyl acetate
5. washThe extract was washed with water
6. customdried
7. concentrationconcentrated to dryness
8. dissolutionThe residue was dissolved in chloroform