Add time:07/17/2019         Source:sciencedirect.com

The electrochemical behaviour of 3-cyano-5-methoxycarbonyl-2,6-dimethyl-4(o-nitrophenyl)-1,4-dihydropyridine and the corresponding N-methyl derivative have been investigated in hydroalcoolic medium. The 4 electron reduction leads to an amino-benzonaphtyridine N-oxide (cyclization from the reaction of the hydroxylamino group with the cyano substituent) when performed in acidic medium; in basic medium, the same reduction leads to a cyclic hydroxamic acid resulting from the condensation of the hydroxylamino group with the ester substituent. Anodic oxidations give the corresponding pyridine or pyridinium derivatives; subsequent reductions of the latter always lead to cyclic hydroxamic acids.

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