4-Hydroxy-2-quinolones. 107. Reaction of triethyl methanetricarboxylate with indoline

The first stage of the reaction of triethyl methanetricarboxylate with indoline is the formation of the diethyl ester of 2-(indoline-1-carbonyl)malonic acid, which then, depending on the conditions selected, may be converted into the ethyl ester of 2-(indoline-1-carbonyl)-3-(indolin-1-yl)-3-oxopropionic acid, methanetri-N-(indolin-1-yl)carboxamide, or the ethyl ester or (indolin-1-yl)amide of 1-hydroxy-3-oxo-5,6-dihydro-3H-pyrrolo3,2,1-ij]quinoline-2-carboxylic acid. __________ Translated From Khimiya Geterotsiklicheskikh Soedinenii, No. 8, pp. 1191–1197, August, 2006.