A new series of pyrano[3,2-c]carbazole and pyrano[2,3-a]carbazole derivatives have been synthesized by one-pot three-component coupling of 4-hydroxycarbazole or 2-hydroxycarbazole, aromatic substituted aldehydes, and (E)-N-methyl-1-(methylsulfanyl)-2-nitroethenamine under microwave irradiation. This rapid one-pot reaction does not require a catalyst, is solvent-free, avoids chromatographic purification, and provides good yields. The synthesized pyranocarbazole derivatives were evaluated for their antiproliferative activity against four cancer cell lines: DU 145 (prostate cancer), MDA-MB-231 (breast cancer), SKOV3 (ovarian cancer), and B16-F10 (skin cancer). N-Methyl-3-nitro-4-(3,4,5-trimethoxyphenyl)-4,7-dihydropyrano[3,2-c]carbazol-2-amine exhibited the most potent antiproliferative activity against the tested cell lines, while other test compounds showed weak or moderate antiproliferative activity, among them N-methyl-3-nitro-4-phenyl-4,7-dihydropyrano[3,2-c]carbazol-2-amine, 4-(4-fluorophenyl)-N-methyl-3-nitro-4,7-dihydropyrano[3,2-c]carbazol-2-amine, and N-methyl-2-nitro-1-phenyl-1,11-dihydropyrano[3,2-a]carbazol-3-amine displayed IC50 values in the low micromolar range.
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Supplementary information file containing 1H and 13C NMR data of compounds 9a,b,e–g,i,j and 1H NMR data of compounds 11a,f is available at the journal website at http://link.springer.com/journal/10593.
Published in Khimiya Geterotsiklicheskikh Soedinenii, 2018, 54(8), 812–818
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Padmaja, P., Anireddy, J.S. & Reddy, P.N. Synthesis and Antiproliferative Activity of Novel Pyranocarbazoles. Chem Heterocycl Comp 54, 812–818 (2018). https://doi.org/10.1007/s10593-018-2354-3
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DOI: https://doi.org/10.1007/s10593-018-2354-3