反应详情

To a stirred solution of 0.50 g (1.81 mmol) of methyl 3-(3-cyclopentoxy-4-methoxyphenyl)-E-propenoate in 70 mL of dry methylene chloride under a nitrogen atmosphere was added dropwise 3.0 mL (3.0 mmol) of a 1.0M solution of diisobutylaluminum hydride in toluene over a 10 minute period at room temperature. The mixture was stirred for 30 minutes at the end of which time the solution was slowly poured over a stirring solution of 30 mL of saturated ammonium chloride. The resulting solution was stirred for 30 minutes during which time a gelatinous solid formed. Absorption of the solid on excess Celite 545 followed by filtration over a pad of Celite 545 and elution with three, 30 mL portions of chloroform provided a yellow suspension. Separation of the layers followed by washing the organic fraction with 30 mL of saturated sodium chloride, drying over magnesium sulfate and concentration gave a crude yellow product. Liquid chromatography over 100 g of silica gel eluting with 30% ethyl acetate in hexane provided the desired, analytically pure product after drying in vacuo.

1. stirringThe resulting solution was stirred for 30 minutes during which time a gelatinous solid
2. customformed
3. customAbsorption of the solid on excess Celite 545
4. filtrationfollowed by filtration over a pad of Celite 545 and elution with three, 30 mL portions of chloroform
5. customprovided a yellow suspension
6. customSeparation of the layers
7. washby washing the organic fraction with 30 mL of saturated sodium chloride
8. dry with materialdrying over magnesium sulfate and concentration
9. customgave a crude yellow product
10. customanalytically pure product after drying in vacuo