One-pot Synthesis of Benzo[<i>b</i>]thiophenes and Benzo[<i>b</i>]selenophenes from <i>o</i>-Halo-Substituted Ethynylbenzenes: Convenient Approach to Mono-, Bis-, and Tris-Chalcogenophene-Annulated Benzenes
procedure for the synthesis of benzo[b]thiophenes and selenophenes from readily available o-halo-ethynylbenzene precursors is described. Regardless of the substituent on the acetylene terminus or the number of cyclization moieties on the precursors, various benzo[b]thiophenes and selenophenes, including not only the parent, alkyl-, and phenyl-substituted derivatives but also benzo[1,2-b:4,5-b′]dithiophenes
描述了一种方便的一锅法,用于从容易获得的邻卤代乙炔基苯前体合成苯并[ b ]噻吩和硒代苯。不论乙炔末端上的取代基或前体上的环化部分数量如何,各种苯并[ b ]噻吩和硒代苯不仅包括母体,烷基和苯基取代的衍生物,而且还包括苯并[1,2- b]可以高产率地制备: 4,5- b ′]二噻吩和二硒吩和苯并[1,2- b: 3,4- b ′:5,6 - b ′′]三噻吩和三硒吩。
Synthesis of 2‐Substituted Benzothio(seleno)phenes and Indoles
<i>via</i>
Ag‐Catalyzed Cyclization/Demethylation of 2‐Alkynylthio(seleno)anisoles and 2‐Alkynyldimethylanilines
Herein, we have successfully developed an efficient protocol for the construction of benzothio(seleno)phenes and indoles through an Ag‐mediated cyclization/demethylation process. Various 2‐substituted benzothio(seleno)phenes and indoles were obtained in good to excellent yields under mild reaction conditions with low catalyst loading. A conceivable reaction mechanism was proposed and supported by an
Tandem free-radical addition/substitution chemistry and its application to the preparation of novel AT<sub>1</sub>receptor antagonists
作者:Maree K. Staples、Rebecca L. Grange、James A. Angus、James Ziogas、Nichole P. H. Tan、Michelle K. Taylor、Carl H. Schiesser
DOI:10.1039/c0ob00573h
日期:——
tested for AT1 receptor antagonist properties. While the sulfur-containing systems were prepared following existing methodology, the selenium-containing analogues required the development of novel, tandem free-radical chemistry involving addition of aryl radicals to alkynes, followed by intramolecular homolyticsubstitution at the higher heteroatom. All four compounds prepared proved to be excellent
An intermolecular radical cascadereaction between readily prepared o‐methylthio‐arylamines or o‐methylselanyl‐arylamines and alkynes for the preparation of valuable benzothiophenes or benzoselenophenes is reported. These transformations occur efficiently with complete regioselectivity and the products are obtained in moderate to good yields. The current protocol is successfully applied to the synthesis