Trifluoroacetic anhydride → HCID 54313191, compound

Participants

Reaction Steps

4.44 ml (31.9 mmol) of trifluoroacetic anhydride were added dropwise at 5°-8° to a suspension of 8.98 g (31.1 mmol) of (S)-10,11,12,12a-tetrahydro-8-oxo-8H-imidazo[5,1-c]pyrrolo[1,2-a]thieno[3,2-e][1,4]diazepine-1-carboxamide in 50 ml of dioxan and 5.4 ml of pyridine. The beige solution obtained was stirred at 50° for 2.5 hours and subsequently poured into 220 ml of ice-water. The resulting precipitate was filtered off. After drying at 70°/10 Torr there were obtained 6.78 g (80%) of (S)-10,11,12,12a-tetrahydro-8-oxo-8H-imidazo[5,1-c]pyrrolo[1,2-a]thieno[3,2-e][1,4]diazepine-1-carbonitrile as a white powder of m.p. 249°-251°.

Provenance & Evidence