Three-component reaction of 5-aryl-4-(quinoxalin-2-yl)-furan-2,3-diones, acetylenedicarboxylic acid dimethyl ester, and triphenylphosphine

详细

Three-component synthesis from 5-aryl-4-(quinoxalin-2-yl)furan-2,3-diones, acetylenedicarboxylic acid dimethyl ester, and triphenylphosphine afforded methyl esters of 1,6-dioxaspiro[4.4]nona-3,7-diene-4-carboxylic and 4H-furo[3,2-c]pyran-3-carboxylic acids.