Abstract
Unprecedented synthesis of chiral (aza)crown ethers of calix[4]arene derivatives bearing a carboxyl amide bridge was described. The synthesis proceeds through condensation of the corresponding dinitriles with optically active 1,2-aminoalcohols, and is catalyzed by the ZnCl2 Lewis acid at elevated temperature in a very efficient one-pot process. The cavity of calix[4](aza)crowns can encapsulate methanol molecules by O-H⋯п interaction, which has been confirmed by X-ray crystal structures and ESI-MS.
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Supported by the National Basic Research Program of China (Grant No. 2007CB925103), the National Natural Science Foundation of China (Grant No. 20602017), and NCET-07-0425
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Li, Z., Teng, M., Ma, J. et al. Unprecedented synthesis of chiral calix[4](aza)crowns and its potent encapsulating methanol. Sci. China Ser. B-Chem. 52, 497–504 (2009). https://doi.org/10.1007/s11426-009-0045-8
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DOI: https://doi.org/10.1007/s11426-009-0045-8