Rhodium-Catalyzed Tandem Conjugate Addition−Mannich Cyclization Reaction: Straightforward Access to Fully Substituted Tetrahydroquinolines
作者:So Won Youn、Ju-Hyun Song、Dai-Il Jung
DOI:10.1021/jo800914c
日期:2008.7.1
A new Rh(I)-catalyzed tandem conjugate addition−Mannich cyclization reaction of imine-substituted electron-deficient alkenes with arylboronic acids has been developed to afford 2,3,4-trisubstituted 1,2,3,4-tetrahydroquinolines. This is the first example involving imine group as a secondary electrophile in Rh(I)-catalyzed tandem reactions.
Visible‐Light‐Driven Isocyanide Insertion to
<i>o</i>
‐Alkenylanilines: A Route to Isoindolinone Synthesis
作者:Anjali Dahiya、Bubul Das、Ashish Kumar Sahoo、Bhisma K. Patel
DOI:10.1002/adsc.202101431
日期:2022.3
intermolecular radical insertion of isocyanides to electron-deficient o-alkenylanilines leading to isoindolinone is reported. Deuterium (D2O) and H2O18 labelling experiments suggest H and O incorporation in the product. The formation of an N-centered radical (NCR) via stepwise PT/ET process was confirmed by radical trapping experiments, photoluminescence, cyclic voltammetry and DFT studies. This photo cascade methodology
报道了可见光介导的异氰化物分子间自由基插入到缺电子的o-烯基苯胺,导致异吲哚啉酮。氘 (D 2 O) 和 H 2 O 18标记实验表明产品中含有 H 和 O。通过自由基捕获实验、光致发光、循环伏安法和 DFT 研究证实了通过逐步 PT/ET 过程形成N中心自由基 (NCR) 。这种光级联方法总体上是一种氧化还原中性工艺,具有无金属条件和广泛的基材范围(32 个示例)。GABA 受体拮抗剂类似物的合成显示了该方法的实用性。
On water: catalyst-free chemoselective synthesis of highly functionalized tetrahydroquinazolines from 2-aminophenylacrylate
作者:Rakesh K. Saunthwal、Monika Patel、Rakesh K. Tiwari、Keykavous Parang、Akhilesh K. Verma
DOI:10.1039/c4gc02154a
日期:——
A green and catalyst free atom-ecomonic straightforward tandem approach for the synthesis of highlyfunctionalized tetrahydroquinazolines by the reaction of 2-aminophenylacrylate 1 with isothiocyanates 2 using water as an environmental friendly solvent is described.
A Highly Efficient Copper(I)-Catalyzed Cascade Reaction of<i>o</i>-Alkenylphenyl Isothiocyanates with Isocyanides Leading to 5<i>H</i>-Benzo[<i>d</i>]imidazo[5,1-<i>b</i>][1,3]thiazines
作者:Wenyan Hao、Jian Huang、Shanshan Jie、Mingzhong Cai
DOI:10.1002/ejoc.201500800
日期:2015.10
The highlyefficientcopper(I)-catalyzedcascadereaction of (E)-3-(2-isothiocyanatophenyl)acrylates and (E)-3-(2-isothiocyanatophenyl)acrylonitriles with isocyanides was explored. The method provides an expedient route for the synthesis of 5H-benzo[d]imidazo[5,1-b][1,3]thiazines in good to excellent yields by using CuCl (10 mol-%) as the catalyst and K3PO4 (2.0 equiv.) as the base in THF at 70 °C
Cu(II)-catalyzed tandem synthesis of 2-imino[1,3]benzothiazines from 2-aminoaryl acrylates via thioamidation and concomitant chemoselective thia-Michael addition
作者:Rakesh K. Saunthwal、Monika Patel、Sushil Kumar、Akhilesh K. Verma
DOI:10.1016/j.tetlet.2014.12.058
日期:2015.1
An efficient copper-catalyzedtandem approach for the synthesis of 2-imino[1,3]benzothiazines by the reaction of easily accessible 2-aminoaryl acrylates with isothiocyanates via in situ thioamidation and concomitant chemoselective intramolecular thia-Michael addition is described. Intramolecular cyclization was selectively triggered by the nitrogen ‘b’ of the thiourea intermediate P.
描述了一种有效的铜催化串联方法,用于合成2-亚氨基[1,3]苯并噻嗪,方法是通过原位硫酰胺化反应和易于化学反应的分子选择性分子内硫杂-迈克尔加成反应,使易于获得的2-氨基芳基丙烯酸酯与异硫氰酸酯反应。硫脲中间体P的氮' b '选择性地触发了分子内环化反应。