Reactions of diethyl 4-p-dimethylaminophenyl-2,6-dimethyl-1,4-dihydropyridine-3,5-dicarboxylate with various electrophiles, X+, give diethyl 2,6-dimethylpyridine-3,5-dicarboxylate and compounds which include the ipso substitution products, p-C6H4X·NMe2.
R. G. R. Bacon and B. A. Osuntogun, J. Chem. Soc., Chem. Commun., 1979, 1159 DOI: 10.1039/C39790001159
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