We have developed a practical method to synthesize fluorostyrene compounds.
我们已经开发出一种合成氟苯乙烯化合物的实用方法。
Synthesis of 3‐Organoselenyl‐2
<i>H</i>
‐Coumarins from Propargylic Aryl Ethers via Oxidative Radical Cyclization
作者:Jun‐Dan Fang、Xiao‐Biao Yan、Li Zhou、Yu‐Zhao Wang、Xue‐Yuan Liu
DOI:10.1002/adsc.201801565
日期:2019.4.23
A metal‐free oxidative radical cyclization/selenylation of propargylic arylethers with diaryl diselenides was developed. This protocol provided an alternative method to synthesize 3‐organoselenyl‐2H‐coumarins via the formation of C−Se bond, C−C bond, and C=O bond in one step. Moreover, a broad range of functional groups (such as halogen, aldehyde, ketone, cyano, and nitro group) were tolerated.
One‐Pot Two‐Step Double Annulation of
<i>N</i>
‐Methoxybenzamides with Alkynes and Alkenes: Regioselective Construction of Isoindolo[2,1‐
<i>b</i>
]isoquinolin‐5(7
<i>H</i>
)‐ones
one-pot two-step doubleannulation strategy to produce isoindolo[2,1-b]isoquinolin-5(7H)-ones via the reaction of N-methoxybenzamides with symmetrical/unsymmetrical alkynes and alkenes has been developed, which proceeds through Ru-catalysed unsymmetrical doubleannulations using a single DG under single catalytic conditions. Furthermore, we have developed amide-alkyne regioselective annulations using unsymmetrical
的单釜两步双环策略以产生异吲哚基[2,1- b ]异喹啉-5(7 ħ) -酮通过的反应Ñ -methoxybenzamides具有对称/不对称炔烃及烯烃已经被开发,其通过进行在单一催化条件下使用单一 DG 进行 Ru 催化的不对称双环化。此外,我们使用不对称的内部炔烃开发了酰胺-炔烃区域选择性环化,该炔烃具有导致单一异构体的氧/氮取代基。所开发的程序提供了广泛的底物范围,容忍了广泛的官能团,并提供了良好的产品收率。
Gold-Catalyzed Ascorbic Acid-Induced Arylative Carbocyclization of Alkynes with Aryldiazonium Tetrafluoroborates
describe, herein, arylative carbocyclization of alkynes catalyzed by gold. In this process, Au(I) is oxidized to Au(III) with aryldiazonium tetrafluoroborates following a photosensitizer-free and irradiation-free protocol. Ascorbic acid acts as a radical initiator, generating aryl radicals. According to DFT calculations, these radicals are added to Au(I), leading to a Au(II) species that is further oxidized
Cyclization and rearrangement products from coupling reactions between terminal o-alkynylphenols or o-ethynyl(hydroxymethyl)benzene and 6-halopurines
作者:Tom Christian Berg、Vebjørn Bakken、Lise-Lotte Gundersen、Dirk Petersen
DOI:10.1016/j.tet.2006.03.112
日期:2006.6
the (Z)-isomer. The latter compound was also formed from a two-step reaction; Sonogashira coupling with O-silylated alkyne followed by deprotection and subsequent 5-exo cyclization. Sonogashira coupling between 6-halopurines and 2-propynylphenol gave only the alkyne coupling product and no cyclization took place. However, the Sonogashira product was unexpectedly rearranged to 6-(3-phenoxypropa-1,2-dienyl)purines