Hydrochloric Acid → 1H-Benzimidazole-2-methanamine, 1-methyl-, hydrochloride (1:2)

Participants

Reaction Conditions

Reaction Steps

Combine N-methyl-o-phenylenediamine (12.2 g, 100 mmol) and glycine (11.3 g, 150 mmol) in 6 N HCl (100 mL). Heat at reflux 90 hours, allow to cool, and concentrate in vacuo to 60 g. Add EtOH (50 mL) and chill at −15° C. Filter the solid and wash with cold 90% EtOH. Dissolve the blue solid in water (30 mL), add EtOH (100 mL) and treat with decolorizing charcoal. Wash the solid with 2:1 EtOH-water and concentrate filtrates in vacuo to 33 g. Add water (15 mL) and warm while adding EtOH (150 mL). Allow to cool, filter, and wash with 90% EtOH to obtain the product as blue flakes. Process the filtrate to obtain a second crop.

Provenance & Evidence