Synthesis of Highly Substituted Furans by the Electrophile-Induced Coupling of 2-(1-Alkynyl)-2-alken-1-ones and Nucleophiles
作者:Tuanli Yao、Xiaoxia Zhang、Richard C. Larock
DOI:10.1021/jo0510585
日期:2005.9.1
induced by an electrophile, provides highlysubstitutedfurans in good to excellent yields under very mild reaction conditions. Various nucleophiles, including functionally substitutedalcohols, H2O, carboxylic acids, 1,3-diketones, and electron-rich arenes, and a range of cyclic and acyclic 2-(1-alkynyl)-2-alken-1-ones readily participate in these cyclizations. Iodine, NIS, and PhSeCl have proven
A novel cascade reaction has been developed for the synthesis of 2,6‐methanopyrrolo[1,2‐b]isoxazoles based on the gold‐catalyzed generation of an N‐allyloxyazomethine ylide. This reaction involves sequential [3+2]/retro‐[3+2]/[3+2] cycloaddition reactions, thus providing facile access to fused and bridged heterocycles which would be otherwise difficult to prepare using existing synthetic methods. Notably
作者:Harim Lechuga-Eduardo、Moises Romero-Ortega、Horacio F. Olivo
DOI:10.1002/ejoc.201501312
日期:2016.1
A synthetic strategy was developed for the preparation of α-ethynyl-α,β-epoxy-β-formyl- and α-ethynyl-α,β-epoxy-β-(hydroxymethyl)cyclohexanone fromcyclohexenone as a model study in a proposed synthesis of escobarines. This highly functionalized ring is found in the anti-TB cassane-type diterpenes escobarines A and B. Introduction of the β-hydroxymethyl group was carried out by reversing the chemical
开发了一种合成策略,用于从环己烯酮制备 α-乙炔基-α,β-环氧-β-甲酰基-和 α-乙炔基-α,β-环氧-β-(羟甲基)环己酮,作为拟议合成中的模型研究escobarines。这种高度官能化的环存在于抗结核 cassane 型二萜 escobarines A 和 B 中。 β-羟甲基的引入是通过使用磺酰基的阴离子和多聚甲醛的亲电攻击逆转烯酮的化学反应性来进行的. β-(羟甲基)环己烯酮的进一步官能化提供了所需的化合物。
Synthesis of Aromatic Rings Embedded in Polycyclic Scaffolds by Triyne Cycloaddition: Competition between Carbonylative and Non-Carbonylative Pathways
Cycloadditions have emerged as some of the most useful reactions for the formation of polycyclic compounds. The carbonylative cycloaddition of triynes can lead to carbonylative and non-carbonylative competitive pathways, each leading to the formation of an aromatic ring. We report herein the one-pot synthesis of fully- and unsymmetrically-substituted tetracyclic 6,5,7,5-troponic and 6,5,6,5-benzenoid
Electrophilic Cyclization of 2-(1-Alkynyl)-2-alken-1-ones Using the I<sub>2</sub>/K<sub>3</sub>PO<sub>4</sub> System: An Efficient Synthesis of Highly Substituted Iodofurans
作者:Yuanhong Liu、Shaolin Zhou
DOI:10.1021/ol051659i
日期:2005.10.1
[reaction: see text] The electrophiliccyclization of 2-(1-alkynyl)-2-alken-1-ones in the presence of various alcohols or carbon-based nucleophiles offers an efficient and straightforward route to highly substituted iodofurans under extremely mild reaction conditions. The iodo derivatives are potential synthetic intermediates for amplification of molecular complexity.