New indole glucosides as biosynthetic intermediates of camptothecin from the fruits of Camptotheca acuminata

Fitoterapia
Peng WangLing-Yi Kong

Abstract

Six new indole glucosides (1-6) and fifteen known alkaloids (7-21) were isolated from the fruit of Camptotheca acuminata. The planar structures of 1-6 were determined on the basis of spectroscopic data analysis and their absolute configurations were established by CD. The isolated indole glucosides showed a clear biosynthetic pathway of camptothecin (7), which started from tryptamine and secologanin and was proposed by synthetic chemists previously. Particularly, compound 1 supplemented the process of the transformation from pumiloside (20) or 3-epi-pumiloside (21) to camptothecin (7). In addition, camptothecin 10-O-β-D-glucopyranoside (13) and norcamptothecin (17), synthesized in the early structural modification of 7, were first isolated from the natural resources. The new compounds 1-6 were screened for their in vitro cytotoxicity but they did not show any exciting result.

References

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Jun 2, 2007·Chemical & Pharmaceutical Bulletin·Takashi TanakaIsao Kouno
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Citations

Nov 11, 2016·Natural Products and Bioprospecting·Bei WangXiao-Dong Luo
Jun 28, 2017·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Chunying LiWenyan Zhao
Mar 28, 2018·Journal of Asian Natural Products Research·He-Xin-Ge ZhangXing-Yun Chai
Jun 29, 2017·European Journal of Mass Spectrometry·Jian-Gang ZhangJi-Jun Chen

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