Glyoxal hydrate → HCID 86734040, compound

Participants

Reaction Steps

3 g. of crude 5,6-diamino-4-[[3-(dimethylamino)propyl]-amino]-2-methylpyridine-3-carboxylic acid, ethyl ester and 1 g. of glyoxal-monohydrate are refluxed in 20 ml. of toluene for 4 hours. After evaporation of the solvent and addition of a small amount of charcoal, the residue is extracted with 50 ml. of boiling gasoline. On cooling 8-[[3-(dimethylamino)propyl]amino]-6-methylpyrido[2,3-b]pyrazine-7-carboxylic acid, ethyl ester precipitates, m.p. 42°-44° (gasoline).

Provenance & Evidence