Acetic Anhydride → HCID 20373044, compound

Participants

Reaction Steps

3.4 g of 4-hydroxy-8-chloro-6-phenyl-1H-s-triazolo[4,3-a][1,5]benzodiazepine-1,5-dione and 1.0 g of acetic anhydride in 10 ml of pyridine are warmed in a steam bath for 0.2 hour and stirred at room temperature for 10 hours. The reaction mixture is cooled, diluted with 100 ml of methylene chloride and washed with 100 ml water containing 0.84 g sodium bicarbonate. The organic phase is washed four times with water, dried and evaporated. The residue is triturated with a minimum amount of ether and the title compound filtered off, dried and recrystallized from methylene chloride and ether.

Provenance & Evidence