描述了四个步骤中的联芳基醚天然产物紫胶酸(1)的全合成。这些步骤包括苯酚7与氟芳烃12之间的S N Ar反应以提供联芳醚13,在醛存在下将硝基选择性还原为胺,Cu介导的Sandmeyer反应以及最终水解以提供目标化合物1。胺14也被转化为已知的碘化物18,其在Pd介导的氢氧化物交叉偶联上得到不纯的1。
In the course of searching for metabolites related to emestrin (3) from Emericella striata (80-NE-22), dethiosecoemestrin (1) was isolated from the methylene chloride extract of the culture filtrate. The tremorgenic mycotoxin, paxilline (6), was also isolated from the mycelial extract. The structure of dethiosecoemestrin was established on the basis of the chemical and spectroscopic evidence as 1. It is postulated that dethiosecoemestrin was biogenetically derived from emestrin.Dethiosecoemestrin was easily degradated to violaceic acid (5). The antimicrobial activity of dethiosecoemestrin was examined.