The intramolecular Knoevenagel condensation of N-cyclohexyl 3-aryl-2-(2-nitrophenyl)acetoxy-3-oxopropionamides 4 obtained from 2-nitrophenylacetic acid (1), arylglyoxals 2 and cyclohexyl isocyanide (3) afforded N-cyclohexyl 3-aryl-2,5-dihydro-2-(2-nitrophenyl)-5-oxofuran-2-carboxamides 6 which underwent reductive cleavage to N-cyclohexyl (Z)-3-aryl-2-hydroxy-3-(2,3-dihydro-2-oxoindol-3-ylidene)propionamides
由2-
硝基苯基
乙酸(1),芳基
乙二醛2和
环己基异氰酸酯(3)获得的N-环己基3-芳基-2-(2-
硝基苯基)乙酰氧基-3-氧代丙酰胺的分子内Knoevenagel缩合得到N-环己基3-芳基-2,5-二氢-2-(2-
硝基苯基)-5-氧
呋喃-2-羧酰胺6还原还原成N-环己基(Z)-3-芳基-2-羟基-3-(
2,3-二氢-2-氧代
吲哚-3-亚丙基)丙酰胺8可能通过不稳定的中间体7。