Arylnaphthalenelignans (ANLs) were known to have axial chirality due to the biphenyl skeleton with hindered rotation at the single bond. However, the stable ANL atropisomers have not been isolated from nature until the present study. Phytochemical separation of the methanol extract of the stems and barks of Justicia procumbens led to the isolation of 11 ANL glycosides including four pairs of new atropisomers
The first totalsynthesis of 6′-hydroxyjusticidin A, isolated from Justicia procumbens L. with good inhibitory activity against cancer cells, has been accomplished. The structure was confirmed by 1H NMR, 13C NMR, and HR-ESI-MS. The key steps involved a Diels–Alder cycloaddition reaction and a reduction in NaBH4.
已经完成了从Justicia procumbens L.分离的对癌细胞具有良好抑制活性的6'-羟基正义素A的第一次全合成。通过1 H NMR,13 C NMR和HR-ESI-MS确认结构。关键步骤涉及Diels-Alder环加成反应和NaBH 4的减少。
Total Syntheses of (+)-Sesamin and (+)-Sesaminol
作者:Ryo Ishikawa、Naoto Yoshida、Yusuke Akao、Yusuke Kawabe、Makoto Inai、Tomohiro Asakawa、Yoshitaka Hamashima、Toshiyuki Kan
DOI:10.1246/cl.140613
日期:2014.10.5
Total syntheses of (+)-sesamin (1a) and (+)-sesaminol (1b), which are major components of sesame lignans derived from Sesamum indicum, were accomplished in a highly stereocontrolled manner. Key steps include an l-proline-catalyzed cross-aldol reaction, which was accelerated with the aid of bifunctional urea 7, and the construction of a furofuran lignan skeleton through a quinomethide intermediate.
A short asymmetric total synthesis of (+)-pisatin is described involving a Sharpless asymmetric dihydroxylation and an “hydrogenative cyclisation” as key steps.
[EN] TUBERCULATIN ANALOGS AS ANTIVIRAL AGENTS<br/>[FR] ANALOGUES DE LA TUBERCULINE UTILISÉS EN TANT QU'AGENTS ANTIVIRAUX
申请人:UNIV HONG KONG BAPTIST UNIV
公开号:WO2022135136A1
公开(公告)日:2022-06-30
Provided herein are tuberculatin analogs that are useful as antivirals, such as anti-HIV, anti-coronaviral, anti-Ebola viral, and anti-influenza viral agents and methods of use thereof.