Benzyloxycarbonyl-2-[1-(2,4-dimethoxybenzyl)-2,5-dioxopyrrolidin-3-yl] glycine methyl ester → 2-[1-(2,4-Dimethoxybenzyl)-2,5-dioxopyrrolidin-3-yl]glycine methyl ester

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反応手順

In a mixture of 50 ml of methanol and 5 ml of acetic acid was dissolved 3 g of benzyloxycarbonyl-2-[1-(2,4-dimethoxybenzyl)-2,5-dioxopyrrolidin-3-yl]glycine methyl ester and after addition of 500 mg of palladium black, the mixture was stirred in a stream of hydrogen at room temperature for 2.5 hours. The catalyst was filtered off and the filtrate was concentrated to dryness under reduced pressure. The concentrate was chromatographed on a silica gel column and eluted with toluene-acetone (4:1). The eluate was concentrated under reduced pressure and to the residue was added 100 ml of ethyl ether-petroleum ether (1:5). The mixture was allowed to stand in a refrigerator overnight and the resulting precipitate was collected by filtration and dried. Yield 1.4 g.

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