Total Synthesis of Highly Oxygenated Bisabolane Sesquiterpene Isolated from <i>Ligularia lankongensis</i>: Relative and Absolute Configurations of the Natural Product
作者:Kenichi Kobayashi、Risako Kunimura、Hirokazu Takagi、Misaki Hirai、Hiroshi Kogen、Hiroshi Hirota、Chiaki Kuroda
DOI:10.1021/acs.joc.7b02688
日期:2018.1.19
configurations of an oxygenated bisabolane natural product, isolated from Ligularia lankongensis, were determined by synthesis. All four possible stereoisomers and their tiglate analogues were synthesized from R-(−)-carvone, and their 1H and 13C NMR spectra were compared to establish the 6R,8S,10S configuration. The stereoselective synthesis of the natural product was also achieved, featuring Brown allylation
含氧bisabolane天然产品的相对和绝对构型中,从分离橐lankongensis,被合成来确定。从R -(-)-香芹酮合成了所有四种可能的立体异构体及其tiglate类似物,并比较了它们的1 H和13 C NMR光谱以建立6 R,8 S,10 S构型。还实现了天然产物的立体选择性合成,其特征在于布朗烯丙基化,钒催化的环氧化和Mitsunobu反应。