Apratoxin A 是一种有效的抗癌天然产物,其关键的聚酮化合物片段对有机合成构成了相当大的挑战,之前的五种合成需要 12 到 20 个步骤来制备。通过结合不同的氧化还原经济催化立体选择性转化,可以快速制备关键的聚酮化合物片段。随后对二醇进行位点选择性保护,该策略只需六个步骤即可制备 apratoxin A 片段,代表了这种聚酮化合物的最短路径。
[EN] MACROCYCLIC THERAPEUTIC AGENTS, METHODS OF MANUFACTURE, AND METHODS OF TREATMENT [FR] AGENTS THÉRAPEUTIQUES MACROCYCLIQUES, DES MÉTHODES DE FABRICATION, ET MÉTHODES DE TRAITEMENT
Systematic Chemical Mutagenesis Identifies a Potent Novel Apratoxin A/E Hybrid with Improved in Vivo Antitumor Activity
作者:Qi-Yin Chen、Yanxia Liu、Hendrik Luesch
DOI:10.1021/ml200176m
日期:2011.11.10
Apratoxins are cytotoxic marine natural products that prevent cotranslational translocation early in the secretory pathway. We showed that apratoxins downregulate receptors and growth factor ligands, giving a one–two punch to cancer cells, particularly those that rely on autocrine loops. Through total synthesis, we tested the effects of amino acid substitutions, including alanine scanning, on the downregulation
Total Synthesis of (−)-Apratoxin A, 34-Epimer, and Its Oxazoline Analogue
作者:Yoshitaka Numajiri、Takashi Takahashi、Takayuki Doi
DOI:10.1002/asia.200800365
日期:2009.1.5
convergent totalsynthesis of the highly cytotoxic marine natural product apratoxin A is accomplished by an 18‐step linear sequence. The high sensitivity of the thiazoline, bearing an adjacent β‐hydroxyl group at the C35‐position, results in the assembly process requiring the inclusion of appropriate protecting groups and the careful optimization of all individual transformations. In the synthesis of 3,7‐dihydroxy‐2
Improved Total Synthesis and Biological Evaluation of Potent Apratoxin S4 Based Anticancer Agents with Differential Stability and Further Enhanced Activity
Apratoxins are cytotoxic natural products originally isolated from marine cyanobacteria that act by preventing cotranslational translocation early in the secretory pathway to downregulate receptor levels and inhibit growth factor secretion, leading to potent antiproliferative activity. Through rational design and total synthesis of an apratoxin A/ E hybrid, apratoxin S4 (1a), we have previously improved the antitumor activity and tolerability in vivo. Compound la and newly designed analogues apratoxins S7-S9 (1b-d), with various degrees of methylation at C34 (1b,c) or epimeric configuration at C30 (1d), were efficiently synthesized utilizing improved procedures. Optimizations have been applied to the synthesis of key intermediate aldehyde 7 and further include the application of Leighton's silanes and modifications of Kelly's methods to induce thiazoline ring formation in other crucial steps of the apratoxin synthesis. Apratoxin S9 (1d) exhibited increased activity with subnanomolar potency. Apratoxin S8 (lc) lacks the propensity to be deactivated by dehydration and showed efficacy in a human HCT116 xenograft mouse model.
MACROCYCLIC THERAPEUTIC AGENTS, METHODS OF MANUFACTURE, AND METHODS OF TREATMENT
申请人:University of Florida Research Foundation, Incorporated
公开号:US20170057996A1
公开(公告)日:2017-03-02
The instant invention describes macrocyclic compounds having therapeutic activity, and the mechanism and methods of treating disorders such as autoimmune diseases, inflammation, and cancer, tumors and cell proliferation related disorders.