Synthesis of some new benzimidazole-5(6)-carboxylic acids


GOKER H., OLGEN S., ERTAN R., AKGUN H., OZBEY S., KENDI E., ...Daha Fazla

JOURNAL OF HETEROCYCLIC CHEMISTRY, cilt.32, ss.1767-1773, 1995 (SCI İndekslerine Giren Dergi) identifier identifier

  • Cilt numarası: 32 Konu: 6
  • Basım Tarihi: 1995
  • Doi Numarası: 10.1002/jhet.5570320617
  • Dergi Adı: JOURNAL OF HETEROCYCLIC CHEMISTRY
  • Sayfa Sayıları: ss.1767-1773

Özet

The title compounds, 1,2-dialkyl-benzimidazole-5(6)-carboxylic acids 34-45 were prepared at four steps; 1) preparation of mono amide derivatives 1-11 by the reaction of methyl 3,4-diaminobenzoate and substituted phenyl or phenoxyacetic acid chlorides; 2) preparation of the methyl benzimidazolecarboxylates 12-22, with zinc chloride and dry hydrogen chloride gas; 3) alkaline hydrolysis of the esters 23-33; and 4) substitution of the imidazole ring with benzyl or p-fluorobenzyl bromide, in alkali medium. 2-Aryl-benzimidazole-5(6)-carboxylic acids 50-53 were prepared via the oxidative condensation of 3,4-diaminobenzoic acid and aromatic aldehydes with cupric ion.