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13 C‐NMR. Spectroscopy of Naturally Occurring Substances. XXXII. Vincaleucoblastine and related alkaloids
Author(s) -
Wenkert Ernest,
Hagaman Edward W.,
Lal Bansi,
Gutowski Gerald E.,
Katner Allen S.,
Miller Jean C.,
Neuss Norbert
Publication year - 1975
Publication title -
helvetica chimica acta
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.74
H-Index - 82
eISSN - 1522-2675
pISSN - 0018-019X
DOI - 10.1002/hlca.19750580608
Subject(s) - chemistry , isomerization , nuclear magnetic resonance spectroscopy , spectroscopy , stereochemistry , organic chemistry , catalysis , physics , quantum mechanics
The total assignment of the 13 C‐shifts of the complex Vinica rosea L. alkaloids vincaleucoblastine, leurosidine and leurosine and of a synthetic isomer of the latter is presented. The structure of leurosidine is corrected and a tentative structure for the acid‐catalyzed product of isomerization of leurosine is proposed.