Recent Developments in the Chemistry of Heteroaromatic N-Oxides
作者:Liming Zhang、Youliang Wang
DOI:10.1055/s-0034-1379884
日期:——
ortho-Alkyl C–H Functionalization 4.3.3 N-Oxide Directed Remote C–H Functionalization 4.4 1,3-Dipolar Cycloaddition 5 Conclusion and Outlook Selected developments in the chemistry of heteroaromatic N-oxides since 2001 are presented in this review. The use of these N-oxides, both in late-transition-metal-catalyzed oxidations of carbon–carbon triple bonds and in regioselective C–H functionalizations of the heteroarene
Direct access to benzofuro[2,3-<i>b</i>]quinoline and 6<i>H</i>-chromeno[3,4-<i>b</i>]quinoline cores through gold-catalyzed annulation of anthranils with arenoxyethynes and aryl propargyl ethers
作者:Manoj D. Patil、Rai-Shung Liu
DOI:10.1039/c9ob00468h
日期:——
aryloxyethynes or arylpropargylethers to construct useful benzofuro[2,3-b]quinoline and 6H-chromeno[3,4-b]quinoline frameworks, respectively; these heterocycles are not readily available from literature methods despite their biological significance. This high atom- and step-economy strategy is highlighted by a broad substrate scope. The reaction mechanism is proposed to proceed through sequential cyclizations
这项工作报告了蒽与芳氧基乙炔或芳基炔丙基醚的轻松环合,分别构建有用的苯并呋喃[2,3- b ]喹啉和6 H- chromeno [3,4- b ]喹啉骨架。尽管这些杂环具有生物学意义,但仍不易从文献方法中获得。广泛的基材范围突出了这种高原子经济和阶梯经济的策略。提出通过α-亚氨基金卡宾中间体的氧芳基,金卡宾和苯甲醛之间的顺序环化来进行反应机理。
Scope and Limitations of the Intermolecular Furan-Yne Cyclization
作者:Anna Zeiler、Michael J. Ziegler、Matthias Rudolph、Frank Rominger、A. Stephen K. Hashmi
DOI:10.1002/adsc.201500081
日期:2015.5.4
Different types of alkynes were reacted with 2,5‐disubstituted furans in order to evaluate the scope of the intermolecular furan‐yne reaction. With ethynyl aryl ethers as starting materials, 2‐phenoxy phenols were accessible in moderate to good yields. A different reaction mode was observed for alkynes bearing electron‐withdrawing substituents. For these starting materials a cis‐selective hydroarylation
Gold(I)‐Catalyzed Intermolecular Formal [4+2] Cycloaddition of
<i>O</i>
‐Aryl Ynol Ethers and Enol Ethers: Synthesis of Chromene Derivatives
作者:Tatiana Suárez‐Rodríguez、Ángel L. Suárez‐Sobrino、Alfredo Ballesteros
DOI:10.1002/chem.202102534
日期:2021.9.9
of O-aryl ynol ethers 1 and enol ethers 2 is described. This intermolecular reaction between two electron-rich unsaturated systems takes place, under mild conditions, in the presence of 5 mol% [IPrAu(CH3CN)]SbF6 as catalyst giving chromene derivatives with good yields. The cycloaddition is completely regio- and stereoselective, as well as versatile for both reactives. Silyl enol ethers can also react
Rhodium-Catalyzed Intermolecular [2+2+2] Cross-Trimerization of Aryl Ethynyl Ethers and Carbonyl Compounds To Produce Dienyl Esters
作者:Yuta Miyauchi、Masayuki Kobayashi、Ken Tanaka
DOI:10.1002/anie.201105519
日期:2011.11.11
thinking: A cationic rhodium(I)/H8‐binap complex catalyzes the chemo‐, regio‐, and stereoselective completely intermolecular [2+2+2] cross‐trimerization of two aryl ethynyl ethers with both electron‐deficient and electron‐rich carbonylcompounds (see scheme; cod=1,5‐cyclooctadiene). This reaction proceeded at room temperature to give aryloxy‐substituted dienyl esters in good yields.
积极思考:阳离子铑(I)/ H 8联键配合物催化两种带有电子缺陷和电子缺陷的芳基乙炔基醚的化学,区域和立体选择性完全分子间[2 + 2 + 2]交叉三聚。富含羰基的化合物(参见方案; cod = 1,5-环辛二烯)。该反应在室温下进行,以良好的收率得到芳氧基取代的二烯基酯。