European Journal of Chemistry

Fused and spiro nitrogen heterocycles of quinuclidine and its C-nucleosides

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Wafaa S. Hamama
Hanafi Hassan Zoorob
Osama Abd El-Magid


Quinuclidin-3-one (1) was used as a versatile intermediate for the synthesis of fused and spiro quinuclidine and its C-nucleosides. The reaction of 1 with formalin and secondary amines namely; morpholine, piperidine, and piperazine afforded the corresponding Mannich bases 2-4 in acid medium. Quinuclidino[3,2-b]pyran 5 has been synthesized via a selective cyclocondensation reaction between Mannich base of quinuclidinone hydrochloride 2 and malononitrile. The transformation of 1 with formalin and methylamine in molar ratio (1:20:2) afforded the spiro compound 7. Ring expansion of 2 under Schmidt reaction conditions gave the 1,3-diazabicyclo[3.2.2]nonanone derivative 6. Eventually, the synthesis of C-nucleosides 10, 12-14 were achieved by using aldohexoses and aldopentose catalyzed by zinc chloride, while, the bis-quinuclidine derivative 15 was obtained by using sodium carbonate. Newly synthesized compounds were characterized by IR, 1H NMR, and mass spectral data.


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Hamama, W. S.; Zoorob, H. H.; El-Magid, O. A. Fused and Spiro Nitrogen Heterocycles of Quinuclidine and Its C-Nucleosides. Eur. J. Chem. 2011, 2, 552-557.

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