Syntheses and Biological Evaluation of Irciniastatin A and the C1−C2 Alkyne Analogue
作者:Tsubasa Watanabe、Takamichi Imaizumi、Takumi Chinen、Yoko Nagumo、Masatoshi Shibuya、Takeo Usui、Naoki Kanoh、Yoshiharu Iwabuchi
DOI:10.1021/ol1000389
日期:2010.3.5
Syntheses of both natural (+)- and unnatural (-)-irciniastatin A (aka psymberin) as well as a C1-C2 alkyne analogue of (+)-irciniastatin A have been achieved. The key features of the syntheses include a highly regioselective epoxide-opening reaction and a late-stage assembly of C1-C6, C8-C16, and C17-C25 fragments. (+)-Alkymberin retained a high level of cytotoxicity, whereas (-)-irciniastatin A showed almost no activity. These results suggest that (+)-alkymberin could be a useful enantio-differential probe for mode-of-action study.