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Symmetric and asymmetric ent-kaurane dimers isolated from Isodon japonicus

✍ Scribed by Li-Bin Yang; Jing Yang; Li-Mei Li; Chun Lei; Yong Zhao; Sheng-Xiong Huang; Wei-Lie Xiao; Quan-Bin Han; Jian-Xin Pu; Han-Dong Sun

Publisher
Elsevier Science
Year
2008
Tongue
French
Weight
229 KB
Volume
49
Category
Article
ISSN
0040-4039

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✦ Synopsis

Bisjaponins A (1) and B (2), two new dimeric ent-kaurane diterpenoids connected with a rare four-membered carbon ring, which was formed by [2+2] reaction, were isolated from the aerial parts of Isodon japonicus. Their structures were elucidated by the analysis of spectroscopic evidence including extensive 2D NMR and MS data. Both the compounds were inactive for their cytotoxicity against human tumor cell lines, K562 and HepG2.

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