Synthesis of Polyacetylenic Acids Isolated from Heisteriaacuminata
摘要:
[GRAPHICS]Four linear polyacetylenic compounds were synthesized. Pentadeca-6,8,10-triynoic acid 1 and octadeca-8,10,12-triynoic acid 2 were synthesized by using acetylene coupling reactions. The syntheses of (Z)-hexadec-11-en-7,9-diynoic acid 3 and (Z)-octadec-12-en-7,9-diynoic acid 4 by using vinylic telluride coupling reactions were accomplished.
The present invention relates to a class of conjugated unsaturated compounds, to a method of preparing such compounds, and to the polymerisation and bio-active uses of such compounds including their use as antimicrobial agents. The invention particularly relates to compounds containing three conjugated unsaturated moieties, at least two of which are yne moieties.
Conjugated Dienyne‐Imides as Robust Precursors of 1‐Azatrienes for 6π Electrocyclizations to Furo[2,3‐
<i>b</i>
]dihydropyridine Cores
作者:Yanjun Wan、Xuchun Zheng、Cheng Ma
DOI:10.1002/anie.201800303
日期:2018.5.4
intermediates for 6πelectrocyclizations was developed by using readily accessible dienyne‐imides and various terminal olefins under PdII catalysis. Taking advantage of the sequential cooperation between preloaded and incorporated functional handles at 1,3‐dien‐5‐yne skeletons, this method not only enables the selective generation of putative 1‐azatrienes but significantly accelerates their thermal 6π‐electrocyclic
通过在Pd II催化下使用易得的二烯炔-酰亚胺和各种末端烯烃,开发了一种新的策略来生成用于6π电环化的功能化1-氮杂三烯中间体。利用这种方法,可以在1,3-dien-5-yne骨架上预先加载和合并功能手柄之间的顺序配合,不仅可以选择性地生成假定的1-氮杂氮杂环丁烷,而且还可以显着加速其6π-电热环闭环反应的过程。一系列高产率的呋喃[2,3- b ]二氢吡啶衍生物。
Aerobic Dimerization of Enediyne Compounds: Construction of Naphthalene Frameworks
作者:Dongxu Wang、Fei Ling、Xiang Liu、Zexiang Li、Cheng Ma
DOI:10.1002/chem.201504085
日期:2016.1.4
annulation of enediynecompounds leading to naphthaleneframeworks has been developed by using Pd(OAc)2 as the catalyst in the presence of NaI under O2 (1 atm). This reaction provided efficient access to a class of symmetric core‐annulated naphthalenes by the homoannulation of enediyne–imides. Intriguingly, the crossover annulation of enediyne–imides and other functionalized enediynes could also be
inherent double controlled strategy of sterically hindered propargyl alcohols without the installing of external directing groups. Its synthetic robustness and practicality have been illustrated by the concise synthesis of bervastatin, a hypolipidemic drug, and late‐stage modification of complex alkynes with precise regioselectivity.
Selectivity in the Ruthenium-Catalyzed Alder Ene Reactions of Di- and Triynes
作者:Eun Jin Cho、Daesung Lee
DOI:10.1021/ja0719430
日期:2007.5.1
Ruthenium-catalyzed Alder enereactions between diynes and triynes with terminal alkenes gave the corresponding enynes and enediynes with high regio- and site-selectivity. The selectivity profile clearly indicates that one of the alkynyl moieties of 1,3-diynes not participating in the reaction determines the regiochemistry, whereas the interplay between steric hindrance and polar substituents at the