Hydrazine hydrate (1:1) → HCID 13190177, compound

Participants

Reaction Steps

A mixture of 500 mg of 1,5-dioxo-1,6-dihydropyrimido[1,2-a]-quinoxalin-2-carboxylic acid and 400 mg of carbonyldiimidazole in 20 ml of dimethylformamide was warmed over a steam bath for 15 minutes and then was cooled in an ice-bath and treated with 1.0 ml of a solution in dimethylformamide containing 1.1 g/10 ml of hydrazine hydrate overnight. The resultant mixture was filtered to obtain 500 mg (95% yield) of 1,5-dioxo-1,6-dihydropyrimido[1,2-a]quinoxaline-2-carbohydrazide melting at >300° C.

Provenance & Evidence