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。
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
Catalytic Transformations of Alkynes into either α-Alkoxy or α-Aryl Enolates: Mannich Reactions by Cooperative Catalysis and Evidence for Nucleophile-Directed Chemoselectivity
作者:Rajkumar Lalji Sahani、Manoj D. Patil、Sachin Bhausaheb Wagh、Rai-Shung Liu
DOI:10.1002/anie.201806883
日期:2018.11.5
The catalytic formation of gold enolatesfrom alkynes, nitrones, and nucleophiles is described, and their Mannich reactions result in nucleophile‐directed chemoselectivity through cooperative catalysis. For 1‐alkyn‐4‐ols and 2‐ethynylphenols, their gold‐catalyzed nitrone oxidations afforded N‐containing dihydrofuran‐3(2H)‐ones with syn selectivity. The mechanism involves the Mannich reactions of gold
C-Quaternary alkynyl glycinols via the Ritter reaction of cobalt complexed alkynyl glycols
作者:K. Grammatoglou、J. Bolsakova、A. Jirgensons
DOI:10.1039/c7ra03965d
日期:——
glycinols based on the Ritterreaction of acetonitrile with cobalt complexed alkynyl glycols is presented. The reaction is promoted by acids such as H2SO4 or BF3·Et2O to give oxazolines as the reaction products. These are subjected to cobalt complex cleavage in oxidative conditions and subsequent acidic hydrolysis providing amino alcohols. The substrates for the Ritterreaction can be easily assembled
提出了一种基于乙腈与钴配合的炔二醇的Ritter反应的C-季炔基甘氨酸的新方法。通过酸如H 2 SO 4或BF 3 ·Et 2促进反应O得到恶唑啉作为反应产物。将它们在氧化条件下进行钴配合物裂解,然后进行酸性水解,得到氨基醇。用于Ritter反应的底物可以很容易地组装,以在两个可变位置引入结构多样性。恶唑啉形成的Ritter反应条件与炔烃末端位置上的一系列取代基相容,从而以中等至良好的产率提供恶唑啉。乙二醇反应中心的甲基,羟甲基和甲硅烷氧基甲基取代基具有良好的耐受性,而该位置的苯基不利于反应。
Molecular Glasses With Functionalizable Groups
申请人:Her Majesty the Queen in Right of Canada as represented by the Minister of National Defence
公开号:US20150232433A1
公开(公告)日:2015-08-20
Disclosed herein is a compound having Formula I:
or a salt thereof, in which R
1
, R
2
and R
3
are as defined herein. Also disclosed are processes to prepare compounds of Formula I and use of Formula I to prepare stable glassy phases.