diseases and decrease crop yields and quality. Polyacetylene alcohols are plant secondary metabolites and bioactive against various pathogenic fungi. They are, however, difficult to synthesize. In the present study, an efficient and highly enantioselective method (>98% ee) was established and employed to achieve the synthesis of the natural C18 polyacetylenes (S,E)-octadeca-1,9-dien-4,6-diyn-3-ol 1, (3R
Catalytic<i>Z</i>-Selective Cross-Metathesis with Secondary Silyl- and Benzyl-Protected Allylic Ethers: Mechanistic Aspects and Applications to Natural Product Synthesis
作者:Tyler J. Mann、Alexander W. H. Speed、Richard R. Schrock、Amir H. Hoveyda
DOI:10.1002/anie.201302538
日期:2013.8.5
Get me a Z (olefin): Efficient catalytic cross‐metathesis reactions that afford Z‐disubstituted allylic silyl or benzyl ethers are reported (see scheme, MAP=monoalkoxide pyrrolide). The approach, in combination with catalytic cross‐coupling, provides a general entry to otherwise difficult‐to‐access alkyne‐containing Z olefins.
给我一个 Z (烯烃):报告了提供Z-二取代烯丙基甲硅烷基或苄基醚的高效催化交叉复分解反应(参见方案,MAP=单烷氧基吡咯化物)。该方法与催化交叉偶联相结合,为其他难以获得的含炔烃Z 烯烃提供了通用入口。
Alkynol natural products target ALDH2 in cancer cells by irreversible binding to the active site
作者:Wolfgang Heydenreuter、Elena Kunold、Stephan A. Sieber
DOI:10.1039/c5cc06424d
日期:——
Chemical proteomic studies reveal ALDH2 as a molecular target of falcarinol in cancer cells.
化学蛋白质组学研究揭示了ALDH2在癌细胞中作为falcarinol的分子靶点。
Synthesis of panaxytriol and its stereoisomers as potential antitumor drugs
Total Synthesis as a Resource in Drug Discovery: The First In Vivo Evaluation of Panaxytriol and Its Derivatives
作者:Heedong Yun、Ting-Chao Chou、Huajin Dong、Yuan Tian、Yue-ming Li、Samuel J. Danishefsky
DOI:10.1021/jo0515475
日期:2005.12.1
We have conducted key preliminary studies into the in vitro and in vivo cytotoxicity of panaxytriol. Through total synthesis, we prepared and evaluated several synthetic panaxytriol analogues, each of which exhibited enhanced cytotoxicity relative to the natural product. Consequently, we have begun to chart the first in vitro SAR map for the compound, which suggests that the C-3 hydroxyl functionality is not critical for biological activity and that, in fact, engagement of the C-9-C-10 diol as an acetonide actually leads to notably enhanced cytotoxicity. Furthermore, through in vivo investigations, we demonstrated that panaxytriol and panaxytriol acetonide (12) moderately suppress tumor growth with little or no toxicity. Finally, preliminary in vitro evaluation of panaxytriol indicates that it possesses neurotrophic activity.