New method for the synthesis of difficultly available sterically hindered tritium-labeled pyridinium derivatives
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- Shchepina, N.E., Avrorin, V.V., Badun, G.A. et al. Chem Heterocycl Comp (2010) 46: 547. doi:10.1007/s10593-010-0544-8
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Direct phenylation of the nitrogen atom in pyridines was noted in a study of the ion-molecule reactions of free nucleogenic phenyl cations generated by β-decay of tritium in labeled benzene. A one-step synthesis of unreported biologically active tritium-labeled N-phenyl-2,6-lutidinium and 2,4,6-collidi-nium salts. Steric factors, which significantly reduce the yield in the case of sym-collidine, play a major role in the direct phenylation of nitrogen.