Acetic Anhydride → HCID 57786141, compound

Participants

Reaction Steps

To a stirred solution of 1-[10-chloro-1-(3,5-dichloropyridin-2-yl)-2,3,4,5-tetrahydro-1H-[1,3]diazepino[1,2-a]benzimidazol-7-yl]propan-1-ol (200 mg, 0.470 mmol) in pyridine (1.0 mL) was added acetic anhydride (133 μL, 1.41 mmol) at room temperature. After 18 h, the reaction mixture was quenched with aqueous sodium hydrogen carbonate, diluted with ethyl acetate, washed with water, hydrochloric acid (1 M) and brine, dried over sodium sulfate, filtrated, and concentrated in vacuo. The residue was purified by flash column chromatography on silica gel eluting with a ethyl acetate/n-hexane gradient mixture to give the title compound as a colorless solid (207 mg, 0.443 mmol, 94%). Analytically pure material was obtained by recrystallization from ethyl acetate/hexane.

Provenance & Evidence