Chemistry of Heterocyclic Compounds

, Volume 44, Issue 4, pp 494-497

First online:

Cyclocondensation of N-prop-2-ynyl-and N-pentadiynyl-o-phenylenediamines with phenyl isothiocyanate

  • R. V. NovikovAffiliated withChemistry Faculty, St. Petersburg State University
  • , M. E. BorovitovAffiliated withChemistry Faculty, St. Petersburg State University
  • , I. A. BalovaAffiliated withChemistry Faculty, St. Petersburg State University Email author 

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Cyclocondensation of N-prop-2-ynyl-o-phenylenediamine with phenyl isothiocyanate leads to the formation of 1-(3-arylprop-2-ynyl)-2,3-dihydro-1H-benzimidazole-2-thiones. In the reactions of diacetylene derivatives — N-penta-2,4-diynyl-o-phenylenediamine — with phenyl isothiocyanate the formation of two heterocyclic nuclei occurs simultaneously to form [1,3]thiazolidino[3,2-a]benzimidazoles.


1-(3-arylprop-2-ynyl)-2,3-dihydro-1H-benzimidazol-2-thiones N-penta-2,4-diynyl-o-phenylenediamine phenyl isothiocyanate N-prop-2-ynyl-o-phenylenediamines [1,3]thiazolidino[3,2]benzimidazoles cyclocondensation