Total synthesis of landomycins Q and R and related core structures for exploration of the cytotoxicity and antibacterial properties
作者:Yao-Hsuan Lai、Soumik Mondal、Hsin-Tzu Su、Sheng-Cih Huang、Mine-Hsine Wu、I.-Wen Huang、Tsai-Ling Yang Lauderdale、Jen-Shin Song、Kak-Shan Shia、Kwok-Kong Tony Mong
DOI:10.1039/d1ra01088c
日期:——
Herein, we report the totalsynthesis of landomycins Q and R as well as the aglycone core, namely anhydrolandomycinone and a related core analogue. The synthesis features an acetate-assisted arylation method for construction of the hindered B-ring in the core component and a one-pot aromatization–deiodination–denbenzylation procedure to streamline the global functional and protecting group manuipulation
在此,我们报道了兰霉素 Q 和 R 以及苷元核心(即脱水兰霉素酮和相关核心类似物)的全合成。该合成采用乙酸酯辅助芳基化方法来构建核心成分中的受阻B环,并采用一锅芳构化-脱碘-去苄基化程序来简化整体功能和保护基团的操作。随后的细胞毒性和抗菌研究表明,landomycin R 是一种针对耐甲氧西林金黄色葡萄球菌的潜在抗菌剂。
Total Synthesis of Isoprekinamycin: Structural Evidence for Enhanced Diazonium Ion Character and Growth Inhibitory Activity toward Cancer Cells
作者:Wei Liu、Matthew Buck、Nan Chen、Muhong Shang、Nicholas J. Taylor、Jalil Asoud、Xing Wu、Brian B. Hasinoff、Gary I. Dmitrienko
DOI:10.1021/ol0712374
日期:2007.7.1
The structurally novel diazobenzo[a]fluorene antibiotic isoprekinamycin (IPK) has been synthesized for the first time employing a Suzuki coupling of a brominated AB ring synthon with a boronate ester representing the D ring, followed by anionic cyclization and appropriate functional group manipulations. The first indication that the diazobenzo[a]fluorene system exhibits in vitro anticancer activity
In this report, a synthetic study of landomycinone via Masamune–Bergmann cyclization is described. A 10-membered 1,2-dialkynylbenzene derivative was designated as a key intermediate in the formation of an angular tetracyclic core via Masamune–Bergmann cyclization. Cyclization was expected to proceed under mild heating conditions based on a DFT transition state analysis of the 10-membered enediyne.
A general strategy for diverse syntheses of anhydrolandomycinone, tetrangulol, and landomycinone
作者:Cheng-Jhe Sie、Venukumar Patteti、Yi-Ru Yang、Kwok-Kong Tony Mong
DOI:10.1039/c7cc09818a
日期:——
A general synthetic strategy based on a protecting group-promoted CH arylation method was developed for total syntheses of anhydrolandomycinone (1), tetrangulol (2), and landomycinone (3) from the same set of starting materials.
Reactions of [2-(2-Naphthyl)phenyl]acetylenes and 2-(2-Naphthyl)benzaldehyde<i>O</i>-Phenyloximes: Synthesis of the Angucycline Tetrangulol and 1,10,12-Trimethoxy-8-methylbenzo[<i>c</i>]phenanthridine
作者:Kennedy J. Ngwira、Amanda L. Rousseau、Myron M. Johnson、Charles B. de Koning
DOI:10.1002/ejoc.201601373
日期:2017.3.17
Suzuki-Miyaura coupling reaction between 1,4,5-(trimethoxynaphthalen-2-yl)boronic acid and 2-iodo-3-methoxy-5-methylbenzaldehyde afforded intermediate, 3-methoxy-5-methyl-2-(1,4,5-trimethoxynaphthalen-2-yl)benzaldehyde. Conversion of this benzaldehyde into the alkyne, 2-(2-ethynyl-6-methoxy-4-methylphenyl)-1,4,5-trimethoxynaphthalene was accomplished utilizing the Corey-Fuchs reaction. Exposure of the derived
1,4,5-(三甲氧基萘-2-基)硼酸和2-碘-3-甲氧基-5-甲基苯甲醛之间的铃木-宫浦偶联反应得到中间体3-甲氧基-5-甲基-2-(1, 4,5-三甲氧基萘-2-基)苯甲醛。该苯甲醛转化为炔烃,2-(2-乙炔基-6-甲氧基-4-甲基苯基)-1,4,5-三甲氧基萘是利用 Corey-Fuchs 反应完成的。将衍生的乙炔暴露于催化铂 (II) 介导的闭环产生所需的四环芳烃产物 1,7,8,12-四甲氧基-3-甲基四苯,其转化为四丁醇。将相关的 3-甲氧基-5-甲基-2-(1,4,5-三甲氧基萘-2-基)苯甲醛邻苯基肟在离子液体中暴露于微波辐射下产生 1,10,12-三甲氧基-8-甲基苯并[c]菲啶,