Synthesis and Cytotoxicity of Ring C-Functionalized Derivatives of the Marine Natural Product (-)-Dibromophakellstatin
作者:Rareş-Petru Moldovan、Michael Zöllinger、Peter G. Jones、Gerhard Kelter、Heinz-Herbert Fiebig、Thomas Lindel
DOI:10.1002/ejoc.201101175
日期:2012.2
A structure–activity relationship study of ring C-functionalized derivatives of the cytotoxic marine natural product(–)-dibromophakellstatin from the sponge Phakellia mauritiana is reported. Functionalization of the pyrrolidine ring was achieved starting from the hydroxy derivative by conversion to the triflate followed by etherification by epimerizing nucleophilic substitution. We identified (12R
对来自海绵 Phakellia mauritiana 的细胞毒性海洋天然产物 (-)-dibromophakellstatin 的环 C 功能化衍生物进行了构效关系研究。从羟基衍生物开始,通过转化为三氟甲磺酸酯,然后通过差向异构亲核取代进行醚化,实现了吡咯烷环的官能化。我们将 (12R)-dibromo-12-hydroxyphakellstatin 鉴定为最具细胞毒性的衍生物,其对一组十二个人类癌细胞系的平均 IC50 值为 1.4 μM。然而,12S 非对映异构体是无活性的。Dehydrophakellstatin 被合成为具有不饱和环 C 的 phakellin 骨架的第一个例子。