[4 + 2]-Cycloaddition of butyl vinyl ether to 3-aroylpyrrolo[1,2- a]quinoxaline-1,2,4(5 H)-triones.

The article discusses butyl vinyl ether [4 + 2]- cycloaddition with 3-aroylpyrrolo[1,2-a]quinoxaline-1,2,4(5H)-triones. Topics include formation of cycloadducts through thermally initiated [4 + 2]-cycloaddition, synthesis of 16-butoxy-14-(4-chlorophenyl)-15-oxa-3,10-diazatetracyclo[ 8.7.0.01,13.04,9]heptadeca-4,6,8,13- tetraene-2,11,12-trione (2b), and measuring of proton nuclear magnetic resonance (H NMR) spectra using tetramethylsilane.