Research on benzimidazole derivatives

Several transformations of 1-alkyl-3-(2-propynyl)-2-iminobenzimidazolines involving the imino group and the triple bond were studied. It is shown that they are readily isomerized in the presence of bases to alienes, which are then converted to 2-methylimidazo1,2-a]benzimidazole derivatives by intramolecular cyclization. 1-Alkyl-3-(-bromoallyl)-2-iminobenzimidazolines can be used for the synthesis of the latter.See 1] for communication XXXIV.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 3, pp. 396–400, March, 1975.