Summary
1. Five flavans have been isolated from the stems ofCotoneaster oligantha A. Pojark, and have been identified; two of them are (+)-catechin and (−)-epicatechin and three are stereoisomeric dimeric procyanidins.
2. The proanthocyanidins have the structure of dimers of 3′,4′,5,7-tetrahydroxyflavan-3-ol with C4-C8 (or C6) bonds between the flavan moieties and with the cis (2R:3R) configuration of the asymmetric centers (flavans 3 and 5) and trans (2R:3S:4S) configuration of the “upper” half and the cis configuration of the “lower” half of the molecule (flavan 4).
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Additional information
S. M. Kirov Kazakh State University, Alma-Ata. Translated from Khimiya Prirodnykh Soedinenii, No. 2, pp. 204–212, March–April, 1978.
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Pashinina, L.T., Chumbalov, T.K., Sheichenko, V.I. et al. Dimeric proanthocyanidins ofCotoneaster oligantha . Chem Nat Compd 14, 166–172 (1978). https://doi.org/10.1007/BF01134620
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DOI: https://doi.org/10.1007/BF01134620