Author： Deyanov A. Konshin M. Semenova Z.
Publisher： Springer Publishing Company
ISSN： 0009-3122
Source： Chemistry of Heterocyclic Compounds, Vol.40, Iss.12, 2004-12, pp. : 1560-1563
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Abstract
Heating anilides (hydrazides) of 5-cyano-6-oxo-2-styrylnicotinic acids in polyphosphoric acid (PPA) leads to amides of 7-aryl-2,5-dioxo-6-phenyl(amino)-1,2,5,6,7,8-hexahydro-1,6-naphthyridine-3-carboxylic acids, which on heating with perchloric acid in acetic acid give the corresponding acids.
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