Reaction, under appropriate conditions, of lithium dialkyl- or diarylcuprates with pyridine in the presence of methyl chloroformate afforded, in good yields, 1-carbomethoxy-4-alkyl (or aryl)-1,4-dihydropyridines. Also formed, in limited but varying amounts (∼2–11%), were the corresponding 1,2-dihydropyridine derivatives.
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Piers et al. (1974) studied this question.