Trifluoroacetic anhydride → HCID 54174090, compound

Participants

Reaction Steps

5.75 ml (41.3 mmol) of trifluoroacetic anhydride were added dropwise at 5°-8° to a suspension of 11.05 g (40.:2 mmol) of (S)-8-oxo-11,11a-dihydro-8H,10H-azeto[1,2-a]imidazo[5,1-c]thieno[3,2-e][1,4]diazepine-1-carboxamide in 55 ml of dioxan and 7 ml of pyridine. The beige solution obtained was stirred at 50° for 2.5 hours and subsequently poured into 50 ml of ice-water. Extraction with methylene chloride (four times), drying over sodium sulfate, filtration and evaporation yielded a pale brown residue which was chromatographed (silica gel, methylene chloride/methanol 10:1). There were obtained 8.5 g (82%) of (S)-8-oxo-11,11a-dihydro-8H,10H-azeto[1,2-a]imidazo[5,1-c]thieno[3,2-e][1,4]diazepine-1-carbonitrile as a white powder of m.p. 211°-213°.

Provenance & Evidence