Hydrazine hydrate (1:1) → HCID 70393503, compound

Participants

Reaction Steps

2.48 g of tert.butyl 2,3,6,7,8,9-hexahydro-5,9-dioxo-8(S)-phthalimido-1H,5H-pyrazolo[1,2-a][1,2]diazepine-1(S)-carboxylate [prepared as described in Example 3(D)] were stirred at room temperature for 0.5 hour in 80 ml of ethanol with 0.3 g of hydrazine hydrate and the mixture was then evaporated. 90 ml of 2N acetic acid were added, the mixture was stirred at room temperature for 1 hour and was then filtered. The filtrate was made basic with solid sodium carbonate and then extracted twice with dichloromethane. The combined dichloromethane extracts were dried over magnesium sulphate and evaporated to give 1.58 g (93%) of tert.butyl 8(S)-amino-2,3,6,7,8,9-hexahydro-5,9-dioxo-1H,5H-pyrazolo[1,2-a][1,2]diazepine-1(S)-carboxylate in the form of a gum.

Provenance & Evidence