I. Ukrainets, N. L. Bereznyakova, A. Davidenko
Nov 20, 2009
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Journal
Chemistry of Heterocyclic Compounds
Abstract
Prolonged treatment of ethyl 1-alkyl-4-hydroxy-2-oxo-1,2-dihydroquinoline-3-carboxylates with refluxing phosphorus oxychloride gives not only the target 4-chloro derivatives but is also accompanied by a marked loss of the 1-N-alkyl groups to form the side product 2,4-dichloro-3-ethoxycarbonylquinoline.