反应详情

2-(4-nitrophenoxy)propionic acid-2-[2-(4-nitrophenoxy)acetoxy]ethyl ester 55 (20 g, 50 mmol) was dissolved in dry dimethylformamide (150 ml) in a pressure vessel, palladium on carbon (5%, 5 g) added, and the mixture stirred under a hydrogen atm. (4 Kg) for 3 hrs. The catalyst was removed by filtration and ice water (1 L) was added to the filtrate. Crude 56 was extracted into ethyl acetate, dried over Na2SO4, distilled and purified by column chromatography on silica gel using chloroform:ethyl acetate (8:2) to give pure 56 (10 g, 58%) as a dark brown syrup.

1. customThe catalyst was removed by filtration and ice water (1 L)
2. additionwas added to the filtrate
3. extractionCrude 56 was extracted into ethyl acetate
4. dry with materialdried over Na2SO4
5. distillationdistilled
6. custompurified by column chromatography on silica gel