Total Synthesis of (10<i>R</i>)- and (10<i>S</i>)-Corossolin: Determination of the Stereochemistry at C-10 of the Natural Corossolin and the Differential Toxicity toward Cancer Cells Caused by the Configuration at C-10
作者:Qian Yu、Zhu-Jun Yao、Xiao-Guang Chen、Yu-Lin Wu
DOI:10.1021/jo982241j
日期:1999.4.1
(10R) and (10S)-corossolin have been synthesized by coupling of the alkyne intermediate 18 with epoxide 27 or 29, respectively. Comparison of the physical data of both synthetic corossolins with those reported for the natural one shows that the configuration at C-10 of the natural corossolin is highly likely to be R. The R isomer is found to be 18 times as active as the S isomer in the preliminary in vitro tests against the B16BL6 cell line.
(10R)和(10S)-corossolin是通过将炔烃中间体18分别与环氧27或29发生偶联反应而合成的。将两种人工合成的corossolin的物理数据与天然corossolin的已报道数据进行对比后发现,天然corossolin在C-10位的构型极有可能是R型。在初步的体外实验中,R型异构体对B16BL6细胞系的抑制活性是S型异构体的18倍。