The Niementowski reaction of anthranilic acid with ethyl acetoacetate revisited: a new access to pyrano[3,2-c]quinoline-2,5-dione
作者:Yevgen M Poronik、Jan Klajn、Wioleta Borzęcka、Daniel T Gryko
DOI:10.3998/ark.5550190.p009.584
日期:——
The reaction of anthranilicacid with ethyl acetoacetate gives rise directly to 4-methylpyrano[3,2-c]quinoline2,5-dione. The mechanism is assumed to involve condensation of the initial product with a second molecule of the β-ketoester. None of the expected compound (2-methyl-4-oxo-1,4-dihydroquinoline-3-carboxylic acid) is formed in the reaction.