Abstract
The reaction between N-paracyclophanyl-substituted hydrazine-carbothioamides and dicyanomethylene-1,3-indanedione (CNIND) furnished planar and central chiral substituted (epiminomethanoimino)-indenofuranyl-1,4-(1,4-dibenzenocyclohexaphane)-1,2-carboxamides as a type of paracyclophanylfuroimidazo[3.3.3]propellanes in 35–81% yields as a major product as single diastereomers, and substituted spiro[indene-2,4′-indenopyran]-3′-carbonitrile (9–12% yields) as a minor product. To prepare the homochiral paracyclophanylpropellane, oxidation of scalemic formylparacyclophane afforded the corresponding acid. Afterward, the acid chloride formation of [2.2]paracyclophane was obtained by chlorination of the corresponding acid. By repeating the previous procedure and utilizing a final HPLC purification, we succeeded in obtaining the target homochiral propellane. Various spectroscopic techniques such as mass spectrometry, 1H NMR, 13C NMR, and X-ray analysis have been used for structure determination and confirmation of the stereochemistry of the isolated products.
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The authors thank Egyptian Mission, Ministry of Higher Education, Egypt for their financial support to Mrs. Lamiaa E. Abd El-Haleem during her accommodation in Karlsruhe Institute für Technology, Karlsruhe, Germany.
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Hassan, A.A., Bräse, S., Aly, A.A. et al. Stereoselective synthesis of homochiral paracyclophanylindenofuranylimidazo[3.3.3]propellanes. Monatsh Chem 152, 1571–1579 (2021). https://doi.org/10.1007/s00706-021-02853-0
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DOI: https://doi.org/10.1007/s00706-021-02853-0