HCID 178452121, Verbindung → HCID 178452119, Verbindung

Beteiligte Stoffe

Reaktionsschritte

4-[(4-Nitro-1H-pyrazole-3-carbonyl)-amino]-piperidine-1-carboxylic acid tert-butyl ester (13.05 g) was dissolved in ethanol/DMF (300 ml/75 ml), treated with 10% palladium on carbon (500 mg) then hydrogenated at room temperature and pressure overnight. The catalyst was removed by filtration through Celite and the filtrate evaporated and re-evaporated with toluene. The crude material was purified by flash column chromatography eluting with EtOAc then 2% MeOH/EtOAc then 5% MeOH/EtOAc. Product containing fractions were combined and evaporated to give 8.78 g of 4-[(4-amino-1H-pyrazole-3-carbonyl)-amino]-piperidine-1-carboxylic acid tert-butyl ester as a brown foam. (LC/MS: Rt 1.91, [M+H]+ 310).

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