Synthesis of gem-dihaloenynes and butatrienes from gem-dihalovinyl derivatives
摘要:
gem-Dihaloenynes were synthesized in high yields from 1,1,4,4-tetrahalo-1,3-butadienes through the Fritsch-Buttenberg-Wiechell (FBW) rearrangement mediated by an organolithium compound. Butatriene derivatives could be obtained efficiently via an organolithium-mediated reaction of o-halo-(2,2-dihalovinyl)benzenes. (C) 2012 Elsevier Ltd. All rights reserved.
A new class of N-doped ionic PAHs<i>via</i>intramolecular [4+2]-cycloaddition between arylpyridines and alkynes
作者:Ravindra D. Mule、Aslam C. Shaikh、Amol B. Gade、Nitin T. Patil
DOI:10.1039/c8cc05743e
日期:——
Reported herein, for the first time, is a copper-promoted intramolecular [4+2]-cycloaddition cascade to access ionic N-doped polycyclic aromatic hydrocarbons (PAHs) with tunable emission wavelengths. It is shown that the reaction can be made catalytic with respect to Cu(OTf)2 when an external oxidant, Selectfluor, was used.
Gold(<scp>i</scp>)-catalyzed nucleophilic cyclization of β-monosubstituted <i>o</i>-(alkynyl)styrenes: a combined experimental and computational study
作者:Cintia Virumbrales、Marta Solas、Samuel Suárez-Pantiga、Manuel A. Fernández-Rodríguez、Marta Marín-Luna、Carlos Silva López、Roberto Sanz
DOI:10.1039/c9ob02126d
日期:——
The stereospecific gold(I)-catalyzed nucleophilic cyclization of β-monosubstituted o-(alkynyl)styrenes to produce C-1 functionalized 1H-indenes including challenging substrates and nucleophiles, such as β-(cyclo)alkyl-substituted o-(alkynyl)styrenes and a variety of alcohols as well as selected electron-rich aromatics, is reported. DFT calculations support the stereochemical outcome of the process
The direct addition of in situgenerated hydrazoic acid to alkynes is realized without solvent by using a gold catalyst derived from a recently designed remotely functionalized biaryl-2-ylphosphine ligand (i.e., WangPhos). With terminal alkynes, the additions are mostly realized with 0.1 mol% catalyst loadings and at 40 °C. With more challenging internal alkynes devoid of direct EWG substitution, the
Copper-Catalyzed Tandem Synthesis of Indolo-, Pyrrolo[2,1-<i>a</i>]isoquinolines, Naphthyridines and Bisindolo/Pyrrolo[2,1-<i>a</i>]isoquinolines via Hydroamination of <i>ortho</i>-Haloarylalkynes Followed by C-2 Arylation
作者:Akhilesh K. Verma、Rajeev R. Jha、Ritu Chaudhary、Rakesh K. Tiwari、Kotla Siva K. Reddy、Abhinandan Danodia
DOI:10.1021/jo301572p
日期:2012.9.21
An efficient approach for the copper-catalyzed regioselective tandemsynthesis of diversely substituted indolo[2,1-a]isoquinolines 11a–r, pyrrolo[2,1-a]isoquinolines 12a–d, and indolo-, pyrrolo[2,1-f][1,6]naphthyridines 14a–f via preferential addition of the heterocyclic amines onto the ortho-haloarylalkynes over N-arylation followed by intramolecular C-2 arylation is described. The scope of the developed
一种铜取代的吲哚并[2,1- a ]异喹啉11a – r,吡咯并[ 2,1 - a ]异喹啉12a – d和吲哚- ,吡咯并[2,1- ]铜催化区域选择性串联合成的有效方法。描述了通过优先将杂环胺加到邻-卤代芳基炔烃上而不是N-芳基化然后分子内C-2芳基化的f ] [1,6]萘啶14a - f。所开发化学方法的范围已成功扩展到直接合成双吲哚-,吡咯并[2,1- a ]异喹啉15a– g是双吲哚并[1,2- a ]喹啉的区域异构体,用作有机单晶场效应晶体管。羟甲基苯并三唑是一种廉价且空气稳定的化合物,已被用作配体,可将简单,易于获得的起始原料一步转化为一类有趣的杂环化合物。
Metal‐Free Aminoiodination of Alkynes Under Visible Light Irradiation for the Construction of a Nitrogen‐Containing Eight‐Membered Ring System
作者:Kyalo Stephen Kanyiva、Tane Marina、Shun Nishibe、Takanori Shibata
DOI:10.1002/adsc.202100019
日期:2021.6.8
method for the synthesis of dihydrodibenzo[c,e]azocine derivatives via a regioselective intramolecular aminoiodination of alkynes under visible light irradiation has been developed. This protocol uses a combination of iodine and hypervalent iodine to realize a sulfonamidyl radical, followed by intramolecular addition to alkyne to form a vinyl radical. Subsequent trapping of iodine radical affords an 8-membered
已经开发了一种在可见光照射下通过炔烃的区域选择性分子内氨基碘化合成二氢二苯并 [ c , e ]azocine 衍生物的方法。该协议使用碘和高价碘的组合来实现磺酰胺基自由基,然后分子内加成到炔以形成乙烯基自由基。随后碘自由基的捕获提供了一个 8 元杂环。还展示了获得的碘化 8 元杂环在 Suzuki-Miyaura 偶联和脱碘中的应用。