Ancistroguineines A and B as well as Ancistrotectorine-naphthylisoquinoline alkaloids from Ancistrocladus guineensis
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Date
1998
Authors
Bringmann, G.
Gonther, C.
Busemann, S.
Schaffer, M.
Olowokudejo, J. D.
Alo, B. I.
Journal Title
Journal ISSN
Volume Title
Publisher
Elsevier Science
Abstract
The isolation of three naphthylisoquinoline alkaloids from the leaves of Ancistrocladus guinegnsis is described. Their complete structures were established by spectroscopic, chiroptical and degradative methods. Thus, two hitherto unknown 5,8'-coupled naphthylisoquinolines, named ancistroguineines A and B, were isolated, constituting the first example of a pair of 3-epimeric naphthylisoquinoline alkaloids. Moreover, ancistrotectorine, a 7,3'-coupled alkaloid previously known only from the South-East Asian species Ancistrocladus tectorius, was isolated. Its absolute stereostructure was confirmed by oxidative degradation and by comparison of experimental and calculated CD spectra.
Description
Staff publications
Keywords
Ancistrocladus guineensis , Ancistrocladaceae , leaves , ancistroguineine A , ancistroguineine B , ancistrotectorine , naphthylisoquinoline alkaloids , biaryls , naturally occurring , quercetin , structural elucidation , Research Subject Categories::NATURAL SCIENCES::Biology
Citation
Bringmann, G. [Et...al] (1998). Ancistroguineines A and B as well as Ancistrotectorine-naphthylisoquinoline alkaloids from Ancistrocladus guineensis. Phytochemistry, Vol.47, 37 - 43pp.