Dimethylformamide → 2-(Diaminomethyleneamino)-4-[5-(1-oxonicotinoylaminomethyl)furan-2-yl]thiazole

Participants

Reaction Steps

Dicyclohexylcarbodiimide (2.3 g) was added slowly to a suspension of nicotinic acid N-oxide (1.5 g) in N,N-dimethylformamide (40 ml) with cooling on an ice bath and the mixture was stirred for 15 minutes with cooling on an ice bath. To the mixture 4-(5-aminomethylfuran-2-yl)-2-(diaminomethyleneamino)thiazole (2.0 g) was added with cooling on an ice bath. The mixture was stirred for an hour with cooling on an ice bath and then stirred for 41 hours at room temperature. The solvent was removed under reduced pressure and the residue was suspended in water. 6N-Hydrochloric acid solution was added to the suspension and the resulting precipitate was removed by filtration. The solvent was removed under reduced pressure and the residue was dissolved in methanol. The insoluble material was removed by filtration and the solvent was removed under reduced pressure. The residue was chromatographed on a silica gel column eluting with a mixture of chloroform and methanol (10:1, V/V). Recrystallization from a mixture of methanol, dioxane and diisopropyl ether afforded 2-(diaminomethyleneamino)-4-[5-(1-oxonicotinoylaminomethyl)furan-2-yl]thiazole (0.30 g).

Provenance & Evidence