Enantioselective Total Synthesis of (+)-Ottelione A, (−)-Ottelione B, (+)-3-epi-Ottelione A and Preliminary Evaluation of Their Antitumor Activity
作者:Hiroshi Araki、Munenori Inoue、Takeyuki Suzuki、Takao Yamori、Michiaki Kohno、Kazuhiro Watanabe、Hideki Abe、Tadashi Katoh
DOI:10.1002/chem.200700789
日期:——
Enantioselective total synthesis of (+)-ottelione A (1) and (-)-ottelione B (2), novel and potent antitumor agents from a freshwater plant, and (+)-3-epi-ottelione A (3), the earlier proposed stereostructure of 1, was efficiently achieved starting from the known tricyclic compound 10. The synthesis involved the following key steps: i) coupling reactions of aldehydes 8 and 9 with the aromatic portion
对映体全合成的(+)-ottelione A(1)和(-)-ottelione B(2),一种来自淡水植物的新型有效的抗肿瘤剂,以及(+)-3-epi-ottelione A(3),从已知的三环化合物10开始有效地实现了较早提出的1的立体结构。合成涉及以下关键步骤:i)醛8和9与芳族部分7(8 + 7-> 15和9+ 7-> 27),ii)环状半缩醛6和27(6-> 17和27 a-> 26 a)的碱诱导的半缩醛开环/异构化反应,和iii)Corey-Winter的还原性烯化反应环状硫代碳酸盐21和36(21-> 22和36-> 37)。目前的全合成完全确定了这些天然产物的绝对构型。细胞生长抑制曲线,COMPARE分析,