Total Synthesis, Structural Elucidation, and Structure–Cytotoxic Activity Relationship of (−)-Gummiferol
作者:Hiroyoshi Takamura、Hiroko Wada、Nan Lu、Osamu Ohno、Kiyotake Suenaga、Isao Kadota
DOI:10.1021/jo302665c
日期:2013.3.15
and stereodivergent synthesis of two possible diastereomers of (−)-gummiferol was achieved, wherein the stepwise epoxidation and Cadiot–Chodkiewicz reaction were utilized for the construction of the diepoxide moiety and triacetylene part, respectively. Detailed comparison of their 1H and 13C NMR data and specific rotation with those of the natural product unambiguously elucidated the absolute stereostructure
实现了两种可能的(-)-古米酚醇非对映异构体的高度立体选择性和立体发散性合成,其中逐步环氧化和Cadiot-Chodkiewicz反应分别用于构建二环氧化合物和三乙炔部分。他们的1 H和13的详细比较C NMR数据和比旋光度与天然产物的比旋光度清楚地阐明了松香酚的绝对立体结构。此外,还评估了合成的木香酚醇,其立体异构体及其截短的类似物的细胞毒活性,这清楚地表明:(1)二环氧化合物的绝对构型对人癌细胞的细胞毒活性影响很小;(2)三乙炔单元是发挥细胞毒活性所需的关键结构元素。