Lead tetra-acetate oxidation of 5-amino-1,2-dimethyltriazolo[4,5-d]benzimidazole gave 5,6-dehydro-1,2-dimethylbenzimidazole, which underwent subsequent cyclo-addition with a variety of dienophiles and dipolarophiles; other 5,6-dehydrobenzimidazoles have been prepared by this method, and also by aprotic diazotisation of the appropriate 6-aminobenzimidazole-5-carboxylic acid.
R. C. Perera and R. K. Smalley, J. Chem. Soc. D, 1970, 1458 DOI: 10.1039/C29700001458
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