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.
Synthesis of Violaceic Acid and Related Compounds through Aryl Triazene
作者:Shin Ando、James Burrows、Kazunori Koide
DOI:10.1021/acs.orglett.7b00141
日期:2017.3.3
MPC1001 is a potent anticancer natural product that contains a violaceic acid moiety. Herein we report the total synthesis of the natural product violaceic acid and its derivative. In this approach, a triazene-directed Ullman coupling proved to be highly effective. We converted the triazene to a hydroxy group by means of a palladium-catalyzedreaction. Treatment of the triazene with trifluoroacetic
The total synthesis of the biaryl ether natural product violaceic acid (1) in four steps is described. The steps included a SNAr reaction between phenol 7 and flouroarene 12 to afford the biaryl ether 13, selective reduction of a nitro group to an amine in the presence of an aldehyde, a Cu mediated Sandmeyer reaction and final hydrolysis to afford the target compound 1. The amine 14 was also converted
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。