Ancistroguineines A and B as well as Ancistrotectorine-naphthylisoquinoline alkaloids from Ancistrocladus guineensis
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Olowokudejo, J. D.
Alo, B. I.
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.
Ancistrocladus guineensis , Ancistrocladaceae , leaves , ancistroguineine A , ancistroguineine B , ancistrotectorine , naphthylisoquinoline alkaloids , biaryls , naturally occurring , quercetin , structural elucidation , Research Subject Categories::NATURAL SCIENCES::Biology
Bringmann, G. [Et...al] (1998). Ancistroguineines A and B as well as Ancistrotectorine-naphthylisoquinoline alkaloids from Ancistrocladus guineensis. Phytochemistry, Vol.47, 37 - 43pp.