Chemistry of Natural Compounds

, Volume 6, Issue 1, pp 88–91 | Cite as

A study of the structure and stereochemistry of ungernia alkaloids by NMR spectroscopy

  • M. R. Yagudaev
  • Kh. A. Abduazimov
  • S. Yu. Yunusov


1. In a study of the NMR spectra of ungerine, dihydroungerine, hippeastrine, hippeastrine acetate, dihydrohippeastrine, dihydrohippeastrine acetate, and unsevine it has been shown that the B and C rings in these compounds have a cis linkage.

2. It has been found that, in contrast to the alkaloid clivonine, in dihydrohippeastrine the B/C ring-linkage is cis, and the N-CH3 group is located above the plane of the benzene ring.

3. The orientations of the H5, H5a, and H11b protons and the substituent OR at C5 of ring C have been established.


Lactone Carbonyl Methylenedioxy Group Stereochemical Feature Double Resonance Method Hippeastrine 


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Copyright information

© Consultants Bureau 1972

Authors and Affiliations

  • M. R. Yagudaev
    • 1
  • Kh. A. Abduazimov
    • 1
  • S. Yu. Yunusov
    • 1
  1. 1.Institute of the Chemistry of Plant Substances, AS UzSSRUSSR

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