Acetic Acid → HCID 178432154, compound

Participants

Reaction Steps

Acetic acid (0.23 ml) was added to a solution of 2,3-diaminobenzoic acid (200 mg, 1.32 mmol) in hydrochloric acid (4M, 3.2 ml) and the mixture was refluxed for 1 hour. Solvents were evaporated and the residual solid was redissolved in boiling methanol (5 ml) and decolorised with activated charcoal. Removal of the solvent furnished 2-methylbenzimidazole-4-carboxylic acid as an amorphous white solid (167.5 mg, 72%); δH (d6 -DMSO) 2.9 (3H, s, imidazole-2-CH3), 7.6-7.8 (1H, t, Ar-5H) 8.1 (2H, d, Ar-4/6H); m/z (EI 176 (M+), 158, 130.

Provenance & Evidence