Novel 4'-aryl-1,2',5'-triphenyl-2',4',6,7-tetrahydrospiro[indazole-5,3'-pyrazol]-4(1H)-ones have been synthesized in moderate yields by 1,3-dipolar cycloaddition of 5-arylmethylidene-1-phenyl-1,5,6,7-tetrahydro-4H-indazol-4-ones and diphenylnitrilimine, generated in situ from N-phenylbenzohydrazonoyl chloride and triethylamine. According to structural analyses by NMR spectroscopy and single crystal X-ray diffraction method, the reaction proceeds regioselectively affording products with C(5)–C(3') connectivity at the spiro center.
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Published in Khimiya Geterotsiklicheskikh Soedinenii, 2018, 54(12), 1117–1120
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Ren, D., Kuang, G. & Li, X. 1,3-Dipolar cycloaddition of diphenylnitrilimine and 5-arylmethylidene-1-phenyl-1,5,6,7-tetrahydro-4H-indazol-4-ones to afford novel spiro[indazole-5,3′-pyrazole] derivatives. Chem Heterocycl Comp 54, 1117–1120 (2018). https://doi.org/10.1007/s10593-019-02401-z
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DOI: https://doi.org/10.1007/s10593-019-02401-z