Formic Acid → HCID 69356779, compound

Participants

Reaction Steps

A solution of methyl 3,4-diamino-5-nitrobenzoate (D245) (1.3 g, 6.16 mmol, 1 equiv) in HCOOH (20 ml) was stirred at 100° C. for 1 h then cooled to room temperature and concentrated in vacuo. The residue was partitioned between AcOEt and a 2N aqueous NaOH solution and the layers were separated. The organic phase was dried over MgSO4 and concentrated in vacuo to give methyl 4-nitro-1H-benzimidazole-6-carboxylate (D250) (1.5 g, 110%) as a light brown solid which was used in the next step without further purification. [M+H]+=222.3, RT=2.29 min.

Provenance & Evidence