The effect of the solvent nature and temperature on the quaternization of 3,5-diethoxycarbonyl-2,6-di- methyl-4-(3-pyridyl)-1,4-dihydropyridine by lipophilic alkyl bromides has been investigated. By comparison of the solvent effect (acetone, acetonitrile, and 2-butanone) on the alkylation of the pyridine fragment of 3,5-diethoxycarbonyl-2,6-dimethyl-4-(3-pyridyl)-1,4-dihydropyridine it was established that conducting the reaction in acetonitrile at 81 °C is the most optimal.
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Dedicated to Academician Valery Nikolaevich Charushin on his jubilee.
Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 5, pp. 721–726, May, 2011.
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Pajuste, K., Gosteva, M., Kaldre, D. et al. Effect of the solvent nature on the course of quaternization of 3,5-diethoxycarbonyl-2,6-dimethyl-4-(3-pyridyl)-1,4-dihydropyridine. Chem Heterocycl Comp 47, 597–601 (2011). https://doi.org/10.1007/s10593-011-0803-3
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DOI: https://doi.org/10.1007/s10593-011-0803-3