Synthesis of All Possible Isomers Corresponding to the Proposed Structure of Montanacin E, and Their Antitumor Activity
作者:Shunya Takahashi、Ryotaro Takahashi、Yayoi Hongo、Hiroyuki Koshino、Kazunori Yamaguchi、Taeko Miyagi
DOI:10.1021/jo901150h
日期:2009.8.21
Total synthesis of 4 and its three diastereomers is described. The key steps involve stereoselective formation of the tetrahydrofuran ring by a cascade cyclization of hydroxy tosylate 7 and an intermolecular cross metathesis between a tetrahydrofuran 5 and a γ-lactone 6. Spectroscopic data of 4 and biosynthetic hypothesis strongly suggest it to be montanacin E. Inhibitory activities of 4 and its isomers
描述了4及其3个非对映异构体的全合成。关键步骤包括通过羟基甲苯磺酸酯7的级联环化以及四氢呋喃5和γ-内酯6之间的分子间交叉易位,立体选择性地形成四氢呋喃环。4的光谱数据和生物合成假说强烈表明其为孟达那星E。还评估了4及其异构体对6种人类实体瘤细胞系的抑制活性。