1-Alkyl-1,4-dihydro-4-iminoquinoline-3-carboxylic acids: Synthesis, structure and properties

Theodorus Van Es, Benjamin Staskun*

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    5 Citations (Scopus)


    1-Alkyl-1,4-dihydro-4-iminoquinoline-3-carboxylates undergo neutral hydrolysis (in H2O or H2O-EtOH mixtures) to yield water-soluble 4-iminoquinoline-3-carboxylic acids and the corresponding 4-oxo esters. Such 4-imino acids are also accessed by treating an appropriate 1-alkyl-1,4-dihydro-4-oxoquinoline-3-carboxylic acid successively with thionyl chloride and an amine-H2O mixture, or from treatment of a 4-imino ester salt with aqueous amine. In the latter procedures 7-fluoro substituted substrates gave rise to 7-alkylamino derivatives even at room temperature. The title compounds are inferred to have an intramolecularly H-bonded charge transfer structure, and some of their chemical reactions and spectral (HRMS, 1H NMR) properties are described.

    Original languageEnglish
    Pages (from-to)13-33
    Number of pages21
    JournalSouth African Journal of Chemistry
    Publication statusPublished - 25 Feb 2002


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