Highly Substituted Lactone/Ester-Containing Furan Library by the Palladium-Catalyzed Carbonylation of Hydroxyl-Substituted 3-Iodofurans
摘要:
Highly substituted lactone- and ester-containing furans have been prepared by the efficient palladium-catalyzed intramolecular cyclocarbonylation or intermolecular carboalkoxylation, respectively, of hydroxyl-containing 3-iodofurans, readily prepared by the iodocyclization of 2(1-alkynyl)-2-alken-1-ones in the presence of various diols.
Cu(I) Catalyst in DMF: An Efficient Catalytic System for the Synthesis of Furans from 2-(1-Alkynyl)-2-alken-1-ones
作者:Nitin T. Patil、Huanyou Wu、Yoshinori Yamamoto
DOI:10.1021/jo050191u
日期:2005.5.1
The cyclization of 2-(1-alkynyl)-2-alken-1-ones 1 proceeded very smoothly in the presence of alcohols 2 with a catalytic amount of Cu(I)Br in DMF at 80 °C, leading to the formation of highlysubstitutedfurans 3. The catalytic system reported herein is easy to handle, compared to the previously known system wherein the reaction between 1 and 2 needed to use moisture sensitive gold(III) chloride.
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
Highly Substituted Furo[3,4-<i>d</i>][1,2]oxazines: Gold-Catalyzed Regiospecific and Diastereoselective 1,3-Dipolar Cycloaddition of 2-(1-Alkynyl)-2-alken-1-ones with Nitrones
作者:Feng Liu、Yihua Yu、Junliang Zhang
DOI:10.1002/anie.200901299
日期:2009.7.13
Rapid access: A gold(I)‐catalyzed1,3‐dipolarcycloaddition of 2‐(1‐alkynyl)‐2‐alken‐1‐ones with nitrones provides a practical, regiospecific, and stereoselective access to highlysubstituted fused bicyclic furo[3,4‐d][1,2]oxazines under mild conditions (see scheme). These fused heterobicyclic compounds can be readily converted into furans or 3,6‐dihydro‐2H‐1,2‐oxazines in a chemoselective fashion
快速获得:金(I)催化的2-(1-炔基)-2-烯丙基-1-酮与1,3-偶极环的加成反应,提供对高取代的稠合双环呋喃的实用,区域特异性和立体选择性的访问[ 3,4- [ d ] [1,2]恶嗪在温和的条件下(请参阅方案)。这些稠合的杂环双环化合物可以以化学选择性方式轻易地转化为呋喃或3,6-二氢-2 H -1,2-恶嗪。
Mechanism of a No-Metal-Added Heterocycloisomerization of Alkynylcyclopropylhydrazones: Synthesis of Cycloheptane-Fused Aminopyrroles Facilitated by Copper Salts at Trace Loadings
作者:Sidney M. Wilkerson-Hill、Diana Yu、Phillip P. Painter、Ethan L. Fisher、Dean J. Tantillo、Richmond Sarpong、Jason E. Hein
DOI:10.1021/jacs.7b06007
日期:2017.8.2
heterocycloisomerization reaction that forms annulated aminopyrroles is presented. Density functional theory calculations and kinetic studies suggest the reaction is catalyzed by trace copper salts and that a Z- to E-hydrazone isomerization occurs through an enehydrazine intermediate before the rate-determining cyclization of the hydrazone onto the alkyne group. The aminopyrrole products are obtained in 36-93% isolated
介绍了形成环氨基吡咯的新杂环异构化反应的机理研究。密度泛函理论计算和动力学研究表明,该反应是由痕量铜盐催化的,并且在腙到炔基上的限速环化之前,通过烯肼中间体发生 Z 到 E 腙异构化。取决于炔基取代基的性质,以36-93%的分离产率获得氨基吡咯产物。开发了一种新的自动采样技术以获得可靠的机械数据。
Enantioselective Synthesis of Highly Substituted Furans by a Copper(II)-Catalyzed Cycloisomerization–Indole Addition Reaction
作者:Vivek Rauniyar、Z. Jane Wang、Heather E. Burks、F. Dean Toste
DOI:10.1021/ja202959n
日期:2011.6.8
A catalytic enantioselective reaction based on a copper(II) catalyst strictly containing chiral anionic ligands is described. In the present work, copper(II)-phosphate catalyst promotes the intramolecular heterocyclization of 2-(1-alkynyl)-2-alkene-1-ones and facilitates high levels of enantioselectivity in the subsequent nucleophile attack. Mechanistic studies suggest that formation of a copper(II)-indole
描述了基于严格包含手性阴离子配体的铜 (II) 催化剂的催化对映选择性反应。在目前的工作中,磷酸铜 (II) 催化剂促进了 2-(1-炔基)-2-alkene-1-ones 的分子内杂环化,并在随后的亲核试剂攻击中促进了高水平的对映选择性。机理研究表明铜(II)-吲哚物种的形成对于催化很重要。