反应详情

[4-(6-Benzyloxyhexanoylamino)-phenoxy]-acetic acid methyl ester 57 (24 grms, 62.33 mmol) was dissolved in a mixture of methanol (200 ml) and dimethyl formamide (50 ml) in a pressure vessel. Palladium on carbon (5%, 15 g) was added and the mixture stirred under an atmosphere of hydrogen (4 kg) for 24 hours. Catalyst was removed by filtration, and the solvents distilled off under vacuum. Crude 58 was purified by column chromatography on silica gel using chloroform as eluant to get pure 58 (4.5 g, 24.4%) as a white powder with an m.p. between 87.5-90.4° C.

1. customCatalyst was removed by filtration
2. distillationthe solvents distilled off under vacuum
3. customCrude 58 was purified by column chromatography on silica gel