Synthesis of Dipolar Ethyleneimidazolium Benzimidazolate Inner Salts and Their Transformation to 2-Vinylbenzimidazoles through a Type of b-Elimination Reaction
The synthesis and spectroscopic properties of the fairly stable title inner salts (5) are reported. For several of the betaines (5), both the highly dipolar character due to the terminal rings and the nature of the spacer promoted a type of beta-elimination reaction. Thus, formation of 2-vinylbenzimidazoles (7) from the corresponding betaines (5) proceeds in high yield under neutral and mild conditions. Following similar treatment, the 1-(2-benzimidazol-2-ylethyl)imidazolium salt (8b) undergo nucleophilic substitution reactions.
ELGUERO J.; KATRITZKY A. R.; EL-OSTA B. S.; HARLOW R. L.; SIMONSEN S. H., J. CHEM. SOC. PERKIN TRANS., PART.1 <JCPK-BH>, 1976, NO 3, 312-315
作者:ELGUERO J.、 KATRITZKY A. R.、 EL-OSTA B. S.、 HARLOW R. L.、 SIMONSEN S. H.