Syntheses of cyclic carbazole oligomers by a 1-pot Knoevenagel reaction without using high dilution methods are described. Cyclic carbazole oligomers of several ring sizes could be obtained in high yields when 3,6-diformyl-9-docosylcarbazole and appropriate aromatic compounds having a bis(cyanoacetate) group were reacted in THF using DMAP as a base at 40 °C.
S. Maruyama, Y. Zhang, T. Wada and H. Sasabe, J. Chem. Soc., Perkin Trans. 1, 1999, 41 DOI: 10.1039/A807158F
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