Total Syntheses of Lobaric Acid and Its Derivatives from the Antarctic Lichen <i>Stereocaulon alpinum</i>
作者:Tai Kyoung Kim、Joung Eun Kim、Ui Joung Youn、Se Jong Han、Il-Chan Kim、Cheon-Gyu Cho、Joung Han Yim
DOI:10.1021/acs.jnatprod.8b00227
日期:2018.6.22
The first total syntheses of the natural products lobaric acid (1) and its derivatives isolated from the Antarctic lichen Stereocaulon alpinum are reported in this study. Lobarin (3), with a pseudodepsidone structure, was synthesized first in 11 steps by utilizing an Ullmann aryl ether coupling reaction, and lobaric acid was synthesized in an additional three steps by a seven-membered lactonization
这项研究报道了从南极地衣性立体固醇分离出的天然产物叶酸(1)及其衍生物的第一批总合成。首先,利用乌尔曼(Ullmann)芳基醚偶联反应,以11个步骤合成具有假二吡啶酮结构的Lobarin(3),并通过七元内酯化反应在另外的三个步骤中合成了肺酸。还从制备的叶酸获得了各种衍生物,并且合成的化合物显示出显着的PTP1B抑制活性。