Camptothecin-related alkaloids from hairy roots of Ophiorrhiza pumila
摘要:
Hairy roots of Ophiorrhiza pumila, a rubiaceous camptothecin-producing plant, were obtained. From an investigation of the secondary metabolites, it was found that the hairy roots produced camptothecin and its related alkaloids, i.e. (3S)-pumiloside, (3S)- and (3R)-deoxypumilosides and strictosamide. We also isolated two new camptothecinoids, OPHR-23 and OPHR-17, the structures of which including the absolute configurations, were determined by spectroscopic analyses and chemical conversion from tryptamine and secologanin. (C) 2002 Elsevier Science Ltd. All rights reserved.
Isolation and partial synthesis of 3(R)- and 3(S)-deoxypumiloside; structural revision of the key metabolite from the camptothecin producing plant, Ophiorrhiza pumila
the C-3 epimeric pair of 3(R)- and 3(S)-deoxypumiloside were found in Ophiorrhiza pumila (Rubiaceae), a source plant of camptothecinoid metabolites. These structures were confirmed by spectroscopic analysis and partial stereoselective syntheses. The configuration at C-3 of the previously reported “deoxypumiloside” is revised to 3(R) from 3(S).
Hairy roots of Ophiorrhiza pumila, a rubiaceous camptothecin-producing plant, were obtained. From an investigation of the secondary metabolites, it was found that the hairy roots produced camptothecin and its related alkaloids, i.e. (3S)-pumiloside, (3S)- and (3R)-deoxypumilosides and strictosamide. We also isolated two new camptothecinoids, OPHR-23 and OPHR-17, the structures of which including the absolute configurations, were determined by spectroscopic analyses and chemical conversion from tryptamine and secologanin. (C) 2002 Elsevier Science Ltd. All rights reserved.