1-(benzyloxycarbonyl)-4-(tert.butoxycarbonyl)-N-tert.butyl-2-piperazinecarboxamide → Tert-butyl 3-(tert-butylcarbamoyl)piperazine-1-carboxylate

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Reaction Steps

1.1 g of 1-(benzyloxycarbonyl)-4-(tert.butoxycarbonyl)-N-tert.butyl-2-piperazinecarboxamide were dissolved in 40 ml of ethanol. 0.1 g of 10% palladium-on-carbon was added and the mixture was hydrogenated at room temperature and under atmospheric pressure for 2 hours. The catalyst was filtered off. The filtrate was evaporated to give 0.74 g of crude product which was purified by flash chromatography on silica gel using 5% methanolin dichloromethane for the elution. After evaporation of the solvents therewas obtained 0.44 g of 4-(tert.butoxycarbonyl)-N-tert.butyl-2-piperazinecarboxamide as an oil: MS: m/e 286 [M+H]+.

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