反应详情

温度

40 °C

2.5 g (11.0 mmol) of 3-(4-hydroxytetrahydrofuran-3-yloxy)-4-methoxybenzonitrile (A 15) in 12 ml of dimethylformamide are added dropwise under a nitrogen atmosphere to a solution of 350 mg (12.0 mmol) of sodium hydride in 12 ml of dimethylformamide and the mixture is heated at 40° C. for 1 h. 1.6 ml (13.0 mmol) of benzyl chloride, dissolved in 6 ml of dimethylformamide, are then added dropwise at RT. The mixture is stirred at RT for 4 h. concentrated, treated with 50 ml of water and acidified with 2 N hydrochloric acid. After extraction with 3×40 ml of ethyl acetate, the combined organic phases are washed with saturated sodium chloride solution, dried over magnesium sulfate and concentrated. For further purification, the product is chromatographed on silica gel [toluene/ethyl acetate=4:1]. The product-containing fractions are concentrated and the residue is crystallized from isopropanol. 3.05 g of the title compound of m.p. 72-75° C. are obtained.

1. additionare then added dropwise at RT
2. concentrationconcentrated
3. additiontreated with 50 ml of water
4. extractionAfter extraction with 3×40 ml of ethyl acetate
5. washthe combined organic phases are washed with saturated sodium chloride solution
6. dry with materialdried over magnesium sulfate
7. concentrationconcentrated
8. customFor further purification
9. customthe product is chromatographed on silica gel [toluene/ethyl acetate=4:1]
10. concentrationThe product-containing fractions are concentrated
11. customthe residue is crystallized from isopropanol