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Reaction of α-halo- and α,α-dihalo-β-oxoaldehydes with o- and m-phenylenediamines
Guseinov,Klimentova,Yudina,Kol'tsova,Moskva
, p. 459 - 461 (1998)
α-Halo-β-oxoaldehydes react with o- and m-phenylenediamines to give α-halo-β-oxoenamines. In the case of o-phenylenediamine, the initially formed monoenamine undergoes concurrent intramolecular cyclization to give benzimidazole and a halocarbonyl compound. α,α-Dihalo-β-oxoaldehydes react with o- and m-phenylenediamines according to the haloformic decomposition scheme involving formylation of amino groups.
