Abstract
The compounds, 2-amino-2',5-dioxo-5,6,7,8-tetrahydrospiro[chromene-4,3'-indoline]-3-carbonitrile (4a), 2-amino-1'-methyl-2',5-dioxo-5,6,7,8-tetrahydrospiro[chromene-4,3'-indoline]-3-carbonitrile (4b), and 2-amino-1',7,7-trimethyl-2',5-dioxo-5,6,7,8-tetrahydrospiro[chromene-4,3'-indoline]-3-carbonitrile (4c) were synthesized and characterized by elemental analyses, spectral studies (FT-IR, NMR, Mass) and single-crystal X-ray analysis. All the compounds crystallize in the monoclinic sp. gr. P21/c. In crystals of all three compounds, the molecules are linked by an elaborate system of N–H⋅⋅⋅O and N–H⋅⋅⋅N hydrogen bonds to form supramolecular structures.
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GB is thankful to the SERB-DST, New Delhi for financial support (Grant no. EMR/2014/001220).
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Sharma, S., Brahmachari, G. & Gupta, V.K. Design, Synthesis, Characterization, and Crystallographic Behaviors of Some Biologically Important Chromene-Annulated Spiro-Oxindoles: A Drive to Introspect the Comparative Structural Information. Crystallogr. Rep. 65, 1179–1186 (2020). https://doi.org/10.1134/S1063774520070147
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DOI: https://doi.org/10.1134/S1063774520070147