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.
This is a preview of subscription content, log in to check access.
Buy single article
Instant access to the full article PDF.
Price includes VAT for USA
Subscribe to journal
Immediate online access to all issues from 2019. Subscription will auto renew annually.
This is the net price. Taxes to be calculated in checkout.
M. R. Yagudaev, Kh. A. Abduazimov, and S. Yu. Yunusov, KhPS [Chemistry of Natural Compounds], 5, 99, 1969.
S. L. Portnova, Yu. N. Sheinker, A. A. Akhrem, A. M. Prokhoda, and A. V. Kamernitskii, ZhOrKh, 3, 44, 1967.
W. A. Hawksworth, P. W. Jeffs, B. K. Tidd, and T. P. Toube, J. Chem. Soc., 1991, 1965.
W. Döpke, M. Bienert, P. W. Jeffs, and D. S. Farrier, Tetrah. Let., no. 5, 451, 1967.
Khimiya Prirodnykh Soedinenii, Vol. 6, No. 1, pp. 94–97, 1970
About this article
Cite this article
Yagudaev, M.R., Abduazimov, K.A. & Yunusov, S.Y. A study of the structure and stereochemistry of ungernia alkaloids by NMR spectroscopy. Chem Nat Compd 6, 88–91 (1970). https://doi.org/10.1007/BF00564166
- Lactone Carbonyl
- Methylenedioxy Group
- Stereochemical Feature
- Double Resonance Method