1,1'-Carbonyldiimidazole → HCID 178522724, compound

Participants

Reaction Steps

A mixture of 1,5-dihydro-1,5-dioxo-4H-1-benzopyrano[3,4-b]pyridine-2-carboxylic acid (2.57 g, 0.01 mole) and 1,1'-carbonyldiimidazole (1.95 g, 0.012 mole) in dimethylformamide is heated at 100 for 60 minutes under nitrogen. The reaction mixture is cooled and stirred at room temperature for 15 minutes. 5-Aminotetrazole monohydrate (1.24 g, 0.012 mole) is added and the resulting mixture is heated at 100 for 60 minutes, cooled, and filtered. The product is recrystallized from dimethylformamide to give white crystals (1.1 g, 34%), m.p. above 300.

Provenance & Evidence