Abstract
The reaction of azomethine ylide generated in situ from ninhydrin and sarcosine/thiaproline with fluorinated cyclopent[b]indole dipolarophiles in refluxing dioxane and methanol afforded a novel class of fluorinated cyclopent[b]indole dispiroheterocycles via 1,3-dipolar cycloaddition. The crystal structures of 4′-[4-(trifluoromethyl)phenyl]-1′,5-dimethyl-2,3-dihydrodispiro[cyclopent[b]-indol-2,3′-pyrrolidine-2′,2″-indene]-1,1″,3″-trione and 4′-(4-fluorophenyl)-5-methyl-2,3-dihydrodispiro[cyclopent[b]indol-2,3′-pyrrolizidine-2′,2″-indene]-1,1″,3″-trione are reported. New compounds are investigated theoretically via DFT calculations utilizing M062X hybrid function with 6-311++G(d,p) basis sets in vacuum. Results from in vitro cytotoxicity screening are compared with those of standard drugs.
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Acknowledgements
Rajendran Satheeshkumar is grateful to the University Grant Commission (UGC-SAP), New Delhi, for BSR—Senior Research Fellowship, which is thankfully acknowledged. Dr. Karnam Jayarampillai Rajendra Prasad greatly acknowledged UGC-Emeritus fellowship for research. Dr. Werner Kaminsky thanks the Department of Chemistry, University of Washington, Seattle, USA, for access to the X-ray diffraction facility. Dr. Koray Sayin thanks to the High Performance and Grid Computing Center (TRUBA Resources), numerical calculations are performed at TUBITAK ULAKBIM.
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Satheeshkumar, R., Sayin, K., Kaminsky, W. et al. Synthesis, spectroscopic, in vitro cytotoxicity and crystal structures of novel fluorinated dispiroheterocycles: DFT approach. Monatsh Chem 149, 141–147 (2018). https://doi.org/10.1007/s00706-017-2050-5
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DOI: https://doi.org/10.1007/s00706-017-2050-5