Unusual synthesis of 2-(2-aryl-2-oxo-ethylidene)-3-oxo-1,2,3,4-tetrahydro-quinoxalin-1-yl(N-cyano-O-phenyl)-carboximidates

Chemistry of α-Oxoesters: A Powerful Tool for the Synthesis of Heterocycles

“…Reaction of N -(2-aminophenyl)- N ′-cyano- O -phenylisourea with 5-aryl-2,3-dihydrofuran-2,3-diones, a cyclic α-oxoesters, was investigated by Nekrasov et al Reactions were performed in dioxane at 50–60 °C for 40 min, and the corresponding 3-(2-oxoarylethylidene)­quinoxaline-2-ones 594 were obtained in 63–75% yields (Scheme ).…”