By an efficient biomimetic synthetic method, several novel 2-substituted benzimidazoles, benzoxazoles, and benzothiadazole
were readily prepared in good yields under mild conditions with 2-substituted imidazolinium iodides as the tetrahydrofolate model compounds
at the oxidation level of formate. The reaction is probably involved in a nucleophilic addition to the C=N bond at the imidazolinium
ring, followed a 1,3-H migration at an imidazolidine intermediate and a salt elimination.
Keywords: Benzimidazole, benzoxazole, benzothiadazole, biomimetic synthesis, imidazolinium iodide, transfer reaction, tetrahydrofolate model.
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